Ch.2 - Atoms & ElementsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

The atomic number represents the identity of the element and reveals the number of protons, whereas the atomic mass reveals the number of protons and neutrons. 

Structure of the Atom

The atom is the fundamental unit of an element and it’s composed of the 3 subatomic particles. 

Concept #1: Discussing Atomic Structure

Atomic Number vs. Atomic Mass

Concept #2: Discussing Atomic Number & Atomic Mass

The number of protons gives the identity of an element. Ions arise when there is an unequal number of protons and electrons. 

Example #1: Identify the unknown element.

Element X (8 protons, 8 electrons, 8 neutrons) 

Element Y (35 protons, 36 electrons, 46 neutrons)

Element Z (12 protons, 10 electrons, 13 neutrons) 

Additional Problems
What do these have in common? A. The same number of protons B. The same number of neutrons C. The same number of electrons D. The same size
 Give the number of protons, the number of neutrons, the number of electrons, and the approximate mass (in amu) for the following particle. 71Ga3+     number of protons    : ______        number of electrons          : ______                  number of neutrons  : ______        approximate mass (amu) : ______
What is the name of the element that has atomic number 59? a) Princeium b) Promethium c) Praeseodymium d) Proctorium e) Protactinium
Which statement concerning the structure of the atom is correct? A. Protons and neutrons have most of the mass and occupy most of the volume of the atom. B. Electrons have most of the mass but occupy most of the volume C. Electrons have most of the mass but occupy very little of the volume of the atom D. Protons and neutrons have most of the mass but occupy very little of the volume of the atom.
How many electrons are necessary to produce a charge of - 1.0 C? What is the mass of this many electrons? 
Which statements about subatomic particles are true? a. If an atom has an equal number of protons and electrons, it will be charge-neutral. b. Electrons are attracted to protons.  c. Electrons are much lighter than neutrons. d. Protons have twice the mass of neutrons.   
Identify the charges of the protons, neutrons, and electrons. A) protons +1, neutrons 0, electrons -1 B) protons 0, neutrons -1, electrons +1 C) protons -1, neutrons 0, electrons +1 D) protons 0, neutrons +1, electrons -1 E) protons +1, neutrons -1, electrons 0
How many electrons would it take to equal the mass of a proton? 
Consider each of the following statements:             I.    An electron has a lower mass than a proton             II.  Electrons are found inside the nucleus of an atom             III. A neutral atom will have the same number of electrons as neutrons Which answer lists all of the true statements above?             A. I only         B. II only        C. I and II        D. I and III      E. All three are true  
A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass of a helium nucleus? 
What is the name of the atom that has the atomic number 36?   a. chloride b. chlorine c. chromium d. krypton e. kryptonite
Consider the species 44 Ca+2. How many electrons, protons, and neutrons does it contain? a. 20P, 20N, 22e b. 20P, 20N, 18e c. 20P, 24N, 18e d. 20P, 24N, 22e e. 44P, 44N, 42e
The mass of a neutron is equal to the mass of a proton plus the mass of an electron. (T/F)
All neutral atoms of tin have 50 protons and 50 electrons. (T/F)
Answer the following questions.  Flerovium was made by bombarding plutonium-244 atoms with calcium-48 ions, effectively combining the two different nuclei to give a flerovium nucleus. Give the number of protons and neutrons in a plutonium-244 nucleus: ______ protons ______ neutrons Give the number of protons and neutrons in a calcium-48 nucleus: ______ protons ______ neutrons Combining these nuclei, how many protons and neutrons would be contained in the new flerovium nucleus:______ protons ______ neutrons The isotope of flerovium initially formed by the above process is very unstable, and it quickly loses three neutrons. Would the resulting atom correspond to a different element (circle one)?  Explain. Yes or No   Would you expect the compound FlO2 to be ionic or molecular? __________________________ How should this compound be named? ______________________________________________ Flerovium was prepared using calcium ions. Assuming that these ions are the common ion formed by calcium, give the charge (magnitude and sign) and the number of electrons contained in one calcium ion.   charge of the ion _______   _____ total number of electrons in one calcium ion _______         number    sign  
Determine the number of protons and electrons in each ion.  a. Al3+
Determine the number of protons and electrons in each ion.  b. Se2–
Determine the number of protons and electrons in each ion.  c. Ga3+
 Fill in the blanks to complete the table. 
Determine the number of protons and electrons in each ion d. Sr2+
Which of the following species is isoelectronic with S  2–? 1. Rb+ 2. Br – 3. Ar 4. As 3– 5. Mg 2+
Fill in the blanks to complete the table. 
In all the neutral atoms, there are equal numbers of (A) protons and neutrons (B) positrons and electrons (C) neutrons and electrons (D) electrons and protons  
Which statement concerning the structure of the atom is correct? (A) Protons and neutrons have most of the mass and occupy most of the volume of the atom. (B) Electrons have most of the mass and occupy most of the volume of the atom. (C) Electrons have most of the mass but occupy very little of the volume of the atom. (D) Protons and neutrons have most of the mass but occupy very little of the volume of the atom.
The number of neutrons in the following ion is:  (A) 17 (B) 20 (C) 21 (D) 37
An argon atom is isoelectronic with (A) Cl (B) Ca (C) Ti4+ (D) N3-
Which pair of particles has the same number of electrons? (A) F-, Mg2+ (B) Ne, Ar (C) Br-, Se (D) Al3+, P3-
Which ion has twenty-eight electrons? A. Cr2+ B.Fe2+ C. Ni2+ D. Zn2+
Which of the following species is isoelectronic with S2- ?  1. Rb+ 2. Br – 3. Ar 4. As3- 5. Mg2+
Which of the following sets contains species that are isoelectronic? A) Cl, Ar, K B) F -, Ne, Na + C) F, Ne, Na D) Al 3+, S 2-, Ar E) P 3-, S 2-, Ar -
The word isoelectronic means having an equal number of electrons. Which of the following statements is/are true below. a. i & ii b. i & iii c. ii & iii d. i only e. iii only
A sodium ion differs from a sodium atom in that the sodium ion (A) has fewer electrons (B) is an isotope of sodium (C) exists only in solution (D) has a negative charge on its nucleus
In which pair are the two species  both isoelectric and isotopic?  
Which of the following statements is TRUE? (A) atoms contain equal numbers of protons and neutrons (B) the mass of an atom is equal to the number of protons + the number of electrons (C) neutrons have a mass of 0 and a charge of 1 (D) to calculate the number of neutrons in an atom, use the mass in the periodic table (E) the atomic number is the number of electrons in an atom
A hydrogen-3 cation has...   A. No electrons. B. The same number of protons and neutrons. C. Three protons. D. Two electrons. E. One neutron.
What is the symbol of the ion having 12 protons and 10 electrons? a. Mg2+ b. C4+ c. O2- d. Ne e. None of these
Which one of the following  species is  not isoelectronic with Kr? a) Xe b) Rb+ c) Y3+ d) Se2- e) Sr2+
What is the molar mass (g/mol) of a sample of aluminum where all the atoms have 15 neutrons? a. 13 b. 15 c. 28 d. 32 e. none of these
How many protons are there in a gold (Au) nucleus? a. 40 b. 55 c. 61 d. 79 e. 187
What is the charge of a Boron (B) ion with 7 electrons? a. -2 b. -1 c. 0 d. 1 e. 2
What happens when a bromine atom becomes a bromide ion? a) A positive ion is formed. b) The bromine nucleus acquires a negative charge. c) The bromide ion is larger than the bromine atom. d) The atomic number of bromine is decreased by one.  
One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. The cation that this atom forms has 28 electrons. What is the symbol of the cation? 1. 65Zn           2. 65Ga3+           3. 65Zn2+           4. 65Ni2+
Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons? 1. 55Mn4+           2. 51Cl4+           3. 51Mn4+           4. 58Ni4+
Identify the following element: a halogen whose anion contains 36 electrons.                   A. Cl                 B. Kr                 C. Rb                 D. Br
Which of the following statements is/are TRUE about subatomic particles? a) An anion has the same number of protons and electrons. b) Neutrons have the same mass as electrons. c) Protons and electrons have opposite, but equal in magnitude, charges. d) Neutrons and electrons are found in the nucleus. 
What do these have in common? 20Ne          19F-          24Mg2+ A. the same number of protons B. the same number of neutrons C. the same number of electrons D. the same size
Vanadium can have multiple ions. When vanadium has this symbol: 51V5+ The atomic number (Z), mass number (A), number of neurons (n) and number of electrons (e) are: a. Z = 23, A = 51, n = 28, e = 18 b. Z = 51, A = 23, n = 28, e = 23 c. Z = 28, A = 51, n = 28, e = 23 d. Z = 28, A = 23, n = 51, e = 18
Which ion has twenty-eight electrons? A. Cr2+ B.Fe2+ C. Ni2+ D. Zn2+
How many neutrons and electrons are present in the cation 8637Rb+. The number of neutrons and electrons are, respectively: a) 86, 36 b) 50, 38 c) 49, 36 d) 49, 38 e) 37, 49
What species is represented by the following information? p+ = 47      n° = 62      e  - = 46 a. Ag+ b. Nd c. Pd d. Ag e. Pd+  
Complete the following table by filling in the missing information for each row.
Predictable charges of some common ions. Notice that the red stepped line that divides metals from nonmetals also separates cations from anions. Hydrogen forms both 1+ and 1- ions.The most common ions for silver, zinc, and scandium are Ag+, Zn2+, and Sc3+. Which of these ions have the same number of electrons as a noble-gas element?
Give names and symbols for the following elements.An element with 23 electrons.
Consider an atom of 10B.What is the symbol of the atom obtained by adding one proton to 10B?
Consider an atom of 10B.What is the symbol of the atom obtained by adding one neutron to 10B?
Fill in the gaps in the following table: Symbol Co3+ Protons 34 76 80 Neutrons 46 116 120 Electrons 36 78 Mass number 59 Net charge 2+ Complete the first row of the table.
Identify the following elements.1224 X
Identify the following elements.2858 X
Identify the following elements.46104 X
Identify the following elements.74183 X
Identify the following elements. 80202 X
Identify the following elements. 78195 X
Identify the following elements. 76184 X
Identify the following elements. 83209 X
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Identify the element 3374 X.
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Identify the element 53127 X.
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Identify the element 63152 X.
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Identify the element 83209 X.
Identify the following atoms.A halogen with 53 electrons
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Give the number of protons and neutrons in 3374 X.
Identify the following atoms.A noble gas with A = 84
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Give the number of protons and neutrons in 53127 X.
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Give the number of protons and neutrons in 63152 X.
Identify the element represented by each of the following symbols and give the number of protons and neutrons in each.Give the number of protons and neutrons in 83209 X.
Element X is toxic to humans in high concentration but is essential to life in low concentrations. Identify element X, whose atoms contain 24 protons. (Refer to the figure above.)
Which of the following drawings represents a neutral Na atom?
Which of the following drawings represents an Na atom?
Give names and symbols for the following elements.An element with atomic number 6.
Give names and symbols for the following elements.An element with 18 protons in its nucleus.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the first column of the table.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the second column of the table.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the third column of the table.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the fourth column of the table.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the fifth column of the table.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the sixth column of the table.
Fill in the blanks to complete the table. Symbol Z A #p #e- #n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____ Complete the seventh column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the first column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the second column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the third column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the fourth column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the fifth column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the sixth column of the table.
Complete the following table. Symbol Z A #p #e #n Charge _____ 8 ____ ____ ____ 8 2- Ca2+ 20 ____ ____ ____ 20 ____ Mg2+ ____ 25 ____ ____ 13 2+ N3- ____ 14 ____ 10 ____ ____ Complete the seventh column of the table.
Fluorine occurs naturally as a single isotope.How many protons, neutrons, and electrons are present in one molecule of deuterium fluoride? (Deuterium is 2 H.)
Fill in the blanks to complete the following table. Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion Ca Ca2+ _____ _____ _____ Be2+ 2 _____ Se _____ _____ 34 Mg _____ _____ 12 Complete the first column of the table.
Fill in the blanks to complete the following table. Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion Ca Ca2+ _____ _____ _____ Be2+ 2 _____ Se _____ _____ 34 Mg _____ _____ 12 Complete the second column of the table.
Fill in the blanks to complete the following table. Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion Ca Ca2+ _____ _____ _____ Be2+ 2 _____ Se _____ _____ 34 Mg _____ _____ 12 Complete the third column of the table.
Fill in the blanks to complete the following table. Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion Ca Ca2+ _____ _____ _____ Be2+ 2 _____ Se _____ _____ 34 Mg _____ _____ 12 Complete the fourth column of the table.
Fill in the blanks to complete the following table. Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion Cl _____ _____ 17 Te _____ 54 _____ Br Br- _____ _____ _____ Sr2+ _____ 38 Complete the fourth column of the table.
Determine whether each of the following statements is true or false.Every atom of a given element has the same number of protons.
Determine whether each of the following statements is true or false.The number of electrons in an atom equals the number of neutrons in the atom.
Determine whether each of the following statements is true or false.The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force.
Define atomic number and mass number.
If an atom has 15 protons, how many electrons does it have?
Where do the protons reside in an atom?
Iodine has a lower atomic weight than tellurium (126.90 for I, 127.60 for Te) even though it has a higher atomic number (53 for I, 52 for Te). Explain.
In what part of the atom does the strong nuclear force operate?
Define A, Z, and X in the following notation used to specify a nuclide: ZA X.
The structure of the atom. A cloud of rapidly moving electrons occupies most of the volume of the atom. The nucleus occupies a tiny region at the center of the atom and is composed of the protons and neutrons. The nucleus contains virtually all the mass of the atom.What is the approximate diameter of the nucleus in units of pm?
What basic properties of the electron were reported with its discovery?
How and by whom was the electron discovered?
List the three subatomic particles that compose atoms.
Give the basic properties (mass and charge) of the proton.
Give the basic properties (mass and charge) of the neutron.
Explain the difference between Z (the atomic number) and A (the mass number).
What is an ion?
What is a cation?
What is an anion?
What is atomic mass?
Which of the following statements about subatomic particles are true?If an atom has an equal number of protons and electrons, it will be charge-neutral.
Which of the following statements about subatomic particles are true?Electrons are attracted to protons.
Which of the following statements about subatomic particles are true?Electrons are much lighter than neutrons.
Which of the following statements about subatomic particles are true?Protons have twice the mass of neutrons.
In complete sentences, describe the similarities and differences between:a neutral atom and an ion of the same element.
To how many significant figures would you need to express the mass of an oxygen-16 atom in amu to notice the change in mass that occurs when it gains an electron?
A period at the end of sentence written with a graphite pencil has a diameter of 1.6 mm. If the period represented the nucleus, approximately how large is the diameter of the entire atom in units of m?
Answer the following questions:What are the main subatomic particles that make up the atom?
Answer the following questions:What is the charge, in units of the electronic charge, of proton?
What is the difference between an atoms atomic number and its mass number?
Answer the following questions:What is the charge, in units of the electronic charge, of neutron?
What is the difference between an elements atomic number and its atomic mass?
Determine whether each of the following statements is true or false.The nucleus has most of the mass and comprises most of the volume of an atom.
How many protons, neutrons, and electrons are in the following atoms?40 Ar,
How many protons, neutrons, and electrons are in the following atoms?65 Zn,
How many protons, neutrons, and electrons are in the following atoms?70 Ga,
How many protons, neutrons, and electrons are in the following atoms?80 Br,
How many protons, neutrons, and electrons are in the following atoms?184 W,
How many protons, neutrons, and electrons are in the following atoms?243 Am.
Fill in the gaps in the following table: Symbol Co3+ Protons 34 76 80 Neutrons 46 116 120 Electrons 36 78 Mass number 59 Net charge 2+ Complete the second row of the table.
Fill in the gaps in the following table: Symbol Co3+ Protons 34 76 80 Neutrons 46 116 120 Electrons 36 78 Mass number 59 Net charge 2+ Complete the third row of the table.
Fill in the gaps in the following table: Symbol Co3+ Protons 34 76 80 Neutrons 46 116 120 Electrons 36 78 Mass number 59 Net charge 2+ Complete the fifth row of the table.
How many protons and neutrons are in the nucleus of the following atoms?27 Al
How many protons and neutrons are in the nucleus of the following atoms?32 S
How many protons and neutrons are in the nucleus of the following atoms?64 Zn
How many protons and neutrons are in the nucleus of the following atoms?207 Pb
Determine the number of protons and electrons in each of the following ions.Ni2 +
Determine the number of protons and electrons in each of the following ions.S2 -
Determine the number of protons and electrons in each of the following ions.Cr3 +
Fill in the gaps in the following table, assuming each column represents a neutral atom: Symbol 79Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207 Complete the first row of the table.
Fill in the gaps in the following table, assuming each column represents a neutral atom: Symbol 79Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207 Complete the second row of the table.
Fill in the gaps in the following table, assuming each column represents a neutral atom: Symbol 79Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207 Complete the third row of the table.
Fill in the gaps in the following table, assuming each column represents a neutral atom: Symbol 79Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207 Complete the fourth row of the table.
How many protons and electrons are in each of the following ions?Be2+
How many protons and electrons are in each of the following ions?Rb+
How many protons and electrons are in each of the following ions?Se2-
How many protons and electrons are in each of the following ions?Au3+
Suppose that atomic masses were based on the assignment of a mass of 12.000 g to 1 mol of carbon, rather than 1 mol of 12C.Find the atomic mass of oxygen.
How many electrons does it take to the equal the mass of a proton?
Fill in the gaps in the following table, assuming each column represents a neutral atom: Symbol 79Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207 Complete the fifth row of the table.
On a dry day, your body can accumulate static charge from walking across a carpet or from brushing your hair.If your body develops a charge of -14 C (microcoulombs), how many excess electrons has it acquired?
A helium nucleus has two protons and two neutrons.How many electrons would it take to equal the mass of a helium nucleus?
How many protons, neutrons, and electrons are in the following atom: (a) 40Ar
How many protons, neutrons, and electrons are in the following atom: (b) 65Zn
How many protons, neutrons, and electrons are in the following atom: 70Ga
How many protons, neutrons, and electrons are in the following atom: (d) 80Br
What is the Z-number and the number of protons, electrons, and neutrons for the element belowprotons __________Neutrons ________Electrons _________Z ___________ Identify the atom and write the appropriate atomic symbol (including the mass and atomic number) for an atom containing 45 protons, and 58 neutrons.    
Complete this table. Note that the atoms/ions are not necessarily neutral.Element:                           Se       ?          ?Mass number:                  75        65        ?No of neutrons:                ?          36        43No of protons:                  ?          ?          36No of electrons:               ?           ?         36Charge:                            -2         +1        ? 
Consider an atom of osmium-190 (190Os). It has:(A) 76 protons, 190 neutrons, 76 electrons(B) 76 protons, 76 neutrons, 114 electrons(C) 76 protons, 114 neutrons, 76 electrons(D) 114 protons, 76 neutrons, 114 electrons(E) 76 protons, 76 neutrons, 76 electrons
How many protons, electrons and neutrons are there in the cation formed from an atom of magnesium that has a mass of 24?(A) 12 protons, 12 electrons, 12 neutrons(B) 12 protons, 10 electrons, 14 neutrons(C) 12 protons, 10 electrons, 12 neutrons(D) 14 protons, 12 electrons, 10 neutrons(E) 10 protons, 12 electrons, 12 neutrons
Match each diagram to the atom or ion it represents. Drag each item to the appropriate bin.
Which statements about subatomic particles are false?a. Protons and electrons have charges of the same magnitude but opposite sign. b. Protons have about the same mass as neutrons. c. Some atoms don't have any protons. d. Protons and neutrons have charges of the same magnitude but opposite signs. 
For each of the following ions, indicate the number of protons and electrons the ion contains.a. Ba2+
For each of the following ions, indicate the number of protons and electrons the ion contains.b. Zn2+
For each of the following ions, indicate the number of protons and electrons the ion contains.c. N3-
For each of the following ions, indicate the number of protons and electrons the ion contains.d. Rb+
Vanadium can have multiple ions. When vanadium has this symbol: 51V3+the atomic number (Z), mass number (A), number of neutrons (n) and numbers of electrons (e) are:A) Z=23, A=51, n=28, e=25B) Z=51, A=23, n=28, e=23C) Z=28, A=51, n=28, e=23D) Z=23, A=51, n=28, e=20
For each of the following ions, indicate the number of protons and electrons the ion contains.e. Co3+
For each of the following ions, indicate the number of protons and electrons the ion contains.f. Te2–
For each of the following ions, indicate the number of protons and electrons the ion contains.g. Br –
How many protons, neutrons, and electrons are in each of the following atoms or ions?a. 2412Mg
How many protons, neutrons, and electrons are in each of the following atoms or ions?b. 2412Mg2+
How many protons, neutrons, and electrons are in each of the following atoms or ions?d. 5927Co3+
How many protons, neutrons, and electrons are in each of the following atoms or ions?e. 5927Co
How many protons, neutrons, and electrons are in each of the following atoms or ions?f. 7934Se
How many protons, neutrons, and electrons are in each of the following atoms or ions?g. 7934Se2– 
How many protons, neutrons, and electrons are in each of the following atoms or ions?h. 6328Ni
How many protons, neutrons, and electrons are in each of the following atoms or ions?i. 5928Ni2+
What is the symbol for an ion with 63 protons, 60 electrons, and 88 neutrons? If an ion contains 50 protons, 68 neutrons, and 48 electrons, what is its symbol? 
What is the symbol of an ion with 16 protons, 18 neutrons, and 18 electrons? What is the symbol for an ion that has 16 protons, 16 neutrons, and 18 electrons?
Complete the following table:                           Number of                   Number of                            Protons in                   Neutrons in              Number of                Net Symbol                 Nucleus                      Nucleus                  Electrons               Charge23892U                                  20                                20                                                           2+                                  23                                28                             20 8939Y                                  35                                44                             36                                  15                                16                                                           3–
Complete the following table:                           Number of                   Number of                            Protons in                   Neutrons in              Number of                Net Symbol                 Nucleus                      Nucleus                  Electrons               Charge5326Fe2+                                  26                                33                                                           3+                                  85                               125                             86                                   13                                14                              10                                                                      76                              54                          2–
a. Specify the number of protons, neutrons, and electrons in the neutral atom bromine-80. Enter your answers as integers separated by commas.b. The ion O-2 has ___ protons and ___ electrons. Enter your answers as integers separated by a comma.c. What isotope has 13 protons and 14 neutrons? Enter the name of the element followed by a hyphen and the mass number (e.g., uranium-234).d. Which element does represent in the following expression: 41/20 X? Enter the chemical symbol of the element.
Give the number of protons, neutrons, and electrons, or the atomic symbol (with X being the element symbol, A being the mass number, and q being the charge), for the following:            Nuclide  AXq             protons                       neutrons                   electrons                  128Te2-                   ­­_____                            ­­­­_____                            ­­­­_____                   59Co2+                      ­­­­_____                            ­­­­_____                            ­­­_____                     _____                       _35__                           _45__                          _36__
Which of the following statements about subatomic particles is TRUE?A) A neutral atom contains the same number of protons and electrons.B) Protons have about the same mass as electrons.C) Electrons make up most of the mass of an atom.D) Protons and neutrons have opposite, but equal in magnitude, charges.E) Neutrons and electrons are found in the nucleus of an atom.
Fill in the gaps in the following table:SymbolCo3+Protons347680Neutrons46116120Electrons3678Mass number59Net charge2+Complete the fourth row of the table.
The ion O 2− has _____ protons and _____ electrons.
What species is represented by the following information? p+ = 47     n = 62     e- = 46 a. Ag+ b. Nd c. Pd d. Ag e. Pd+
Fill in the gaps in the following table:
Fill in the gaps in the following table:
Which statement is true?(A) The nucleus of an atom contains neutrons and electrons.(B) The atomic number of an element is the number of protons in one atom.(C) The mass number of an atom is the number of protons in the nucleus plus the number of electrons outside.(D) The number of electrons outside the nucleus is the same as the number of the neutrons in the nucleus.
Fill in the gaps in the following table:
Complete the following table:
The species O 2-, F -, N 3- and Na+ are all a) anions. b) cations. c) isotopes. d) isoelectronic. e) halogens.
Complete the following table.84Kr            ____ protons       _____ neutrons        _____ mass number       ______ electron132Ba2+      ____ protons       _____ neutrons       _____ mass number       ______ electron32S2-           ____ protons       _____ neutrons        _____ mass number       ______ electron_______     _35_ protons       _____ neutrons       __80_ mass number       __36__ electron
Which of the following ions is not isoelectronic with Xenon (Xe)?a. Cs +b. I -c. Sr 2+d. Te 2-e. all of the above choices are isoelectronic with Xenon
Which of the following species is isoelectronic with Kr? a) Xe b) K+ c) In3+ d) S2- e) Sr2+
Give the complete chemical symbol for the following:a. an anion with 36 electrons, 35 protons and 46 neutrons b. a neutral uranium atom with 143 neutrons in its nucleus c. a cation with a +1 charge that has 18 electrons and 20 neutrons
A proton weighs 1.007276 amu, a neutron weighs 1.008665 amu, and an electron weighs 5.486 × 10−4 amu. What is the expected mass of a beryllium-9 nucleus, based on the total mass of its protons and neutrons? Express your answer in atomic mass units using seven significant figures.
All of the following species are isoelectronic  except a) Na+ b) Mg2+ c) Ne d) F - e) Ca2+
Fill in the missing blanks on the following table:
How many neutrons are there in an atom of lead whose mass is 208 amu?a. 290b. 126c. 208d. 82e. 145
The number of protons in an atom determines the identity of the atom. What does the number and arrangement of the electrons in an atom determine? What does the number of neutrons in an atom determine?
Determine the number of electrons, protons, and neutrons in the following chemical symbol.
Specify the number of protons, neutrons, and electrons in the neutral atom iron-56. Enter your answers as integers separated by commas. 
The total numbers of neutrons, protons, and electrons in 27Al3+ are: A. 14 neutrons, 13 protons, 13 electrons B. 35 neutrons, 17 protons, 18 electrons C. 14 neutrons, 13 protons, 10 electrons D. 18 neutrons, 17 protons, 18 electrons E. 13 neutrons, 10 protons, 14 electrons
The ion has  3919 K+ A) 18 electrons, 18 protons, 21 neutrons B) 19 electrons, 18 protons, 20 neutrons C) 18 electrons, 19 protons, 20 neutrons D) 19 electrons, 19 protons, 39 neutrons E) 18 electrons, 19 protons, 19 neutrons
What does "X" represent in the following symbol?a. mercuryb. chlorinec. scandiumd. brominee. selenium
The ion N3- has ___________ protons and _____________ electrons?Enter the chemical symbol of the element.
The ion 3919K+ has:a. 18 electrons, 18 protons, 21 neutronsb. 19 electrons, 18 protons, 20 neutronsc. 18 electrons, 19 protons, 20 neutronsd. 19 electrons, 19 protons, 39 neutronse. 18 electrons, 19 protons, 19 neutrons
The mass number is equal to       A) the sum of the number of the neutrons and electrons. B) the sum of the number of the electrons and protons. C) the sum of the number of protons and neutrons. D) the sum of the number of protons, neutrons, and electrons.
An iron-56 nucleus contains      A) 56 protons and 56 neutrons. B) 26 protons and 30 neutrons. C) 56 protons and 26 neutrons. D) 30 protons and 26 neutrons. E) 26 protons and 26 neutrons.
Determine the number of protons, neutrons and electrons in the following:   4018X A) p+ = 18       n° = 22             e- = 40 B) p+ = 22       n° = 18             e- = 18 C) p+ = 40       n° = 22             e- = 18 D) p+ = 18       n° = 22             e- = 18 E) p+ = 18       n° = 18             e- = 22  
Identify each of the following elements:a. a member of the same family as oxygen whose most stable ion contains 54 electrons
Identify each of the following elements:b. a member of the alkali metal family whose most stable ion contains 36 electrons
The atomic number indicates __________.   A) the total number of neutrons and protons in a nucleus B) the number of neutrons in a nucleus C) the number of protons or electrons in a neutral atom D) the number of atoms in 1 g of an element E) the number of different isotopes of an element
Identify each of the following elements:c. a noble gas with 18 protons in the nucleus
What is the identity of element Q if the ion Q 2+ contains 10 electrons?       A) Ne              B) O                 C) Mg              D) C
Write the symbol of each atom using the  AZX format.
Determine whether the following statement is true or false. If false, correct the statement to make it true: (c) The number of electrons in an atom equals the number of neutrons in the atom.
Write the symbol of each atom using the  AZX format.
Determine whether the following statement is true or false. If false, correct the statement to make it true: (d) The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force.
How many electrons are in the ion, P 3-?  A) 12     B) 34     C) 28     D) 18
What species is represented by the following information?p+ = 47            n° = 62                       e- = 46A) Ag+     B) Pd+     C) Ag     D) Nd     E) Pd
Which of the drawings below represents a Ca 2+ ion?      A) drawing (a)      B) drawing (b)      C) drawing (c) D) drawing (d)   
Give the number of protons, neutrons, and electrons, or the atomic symbol (with X being the element symbol, A being the mass number, and q being the charge), for the following:            Nuclide  AXq             protons                       neutrons                     electrons                  122Sb3-                 __­­­­____                          _______                      ______                  65Zn2+                  _______                        _______                      ______                  _______                 ___35___                        ___45__                       __36___
Give the formula of a negative ion that would have the same number of electron of the following positive ion.a. Na+
Give the formula of a negative ion that would have the same number of electron of the following positive ion.b. Ca2+
Give the formula of a negative ion that would have the same number of electron of the following positive ion.c. Al3+
Give the formula of a negative ion that would have the same number of electron of the following positive ion.d. Rb+
Give an example of an ionic compound where both the anion and the cation are isoelectronic with the following noble gases.a. Ne
Give an example of an ionic compound where both the anion and the cation are isoelectronic with the following noble gases.b. Ar
Give an example of an ionic compound where both the anion and the cation are isoelectronic with the following noble gases.c. Kr
Give an example of an ionic compound where both the anion and the cation are isoelectronic with the following noble gases.d. Xe
Part ASpecify the number of protons, neutrons, and electrons in the neutral atom copper-64.Enter your answers as integers separated by commas.Part BThe ion S2− has _____ protons and _____ electrons.Enter your answers as integers separated by a comma.Part CWhat isotope has 17 protons and 18 neutrons?Enter the name of the element followed by a hyphen and the mass number (e.g., uranium-234).Part DWhich element does X represent in the following expression: 5525X?Enter the chemical symbol of the element.
Do both members of the following pairs have the same number of protons? Neutrons? Electrons? Which pair(s) consist(s) of atoms with the same Z value? N value? A value?(a) 168O and 178O(b) 4018Ar and 4119K(c) 6027Co and 6028Ni
Do both members of the following pairs have the same number of protons? Neutrons? Electrons? Which pair(s) consist(s) of atoms with the same Z value? N value? A value?(a) 31H and 32He(b) 146C and 157N(c) 199F and 189F 
While it is helpful to know that many ions have the same number of electrons as a noble gas, many elements, especially among the metals, form ions that do not have the same number of electrons as a noble gas.Use the periodic table shown below, to determine which of the following ions have the same number of electrons as a noble gas.
Which of the following atoms and ions is (are) isoelectronic with S 2+: Si4+, Cl3+, Ar, As3+, Si, Al3+?
Write the symbol for each of the following ions: (a) the ion with a 1+ charge, atomic number 55, and mass number 133
Write the symbol for each of the following ions: (b) the ion with 54 electrons, 53 protons, and 74 neutrons
Write the symbol of each atom using the  format.a. 
Write the symbol for each of the following ions:(c) the ion with atomic number 15, mass number 31 and a 3− charge
Which of the following is a symbol representing the ion obtained by removing two electrons from 63Cu ?
Write the symbol for each of the following ions:(d) the ion with 24 electrons, 30 neutrons, and a 3+ charge
What is the symbol for the isotope of 63Cu that possesses 36 neutrons?
Write the symbol of each atom using the  format.b. 
Write the symbol of each atom using the  format.c. 
Write the symbol for each of the following ions:(b) the ion with 36 electrons, 35 protons, and 45 neutrons
Write the symbol for each of the following ions: (c) the ion with 86 electrons, 142 neutrons, and a 4+ charge
Write the symbol for each of the following ions:(d) the ion with a 2+ charge, atomic number 38, and mass number 87
An element’s most stable ion has a 2+ charge. If the ion of element X has a mass number of 230 and has 86 electrons,what is the identity of the element, and how many neutrons does it have?
Write the AZX notation for each atomic depiction:
Write the AZX notation for each atomic depiction: 
Complete the following table, including the mass number and the atomic number with the symbol for the isotope.
Write the AZX notation for each atomic depiction:
Write the AZX notation for each atomic depiction:
Write the AZX notation for each atomic depiction:
Write the AZX notation for each atomic depiction:
For each ionic depiction, give the name of the parent atom, its mass number, and its group and period numbers:
For each ionic depiction, give the name of the parent atom, its mass number, and its group and period numbers:
For each ionic depiction, give the name of the parent atom, its mass number, and its group and period numbers:
For each ionic depiction, give the name of the parent atom, its mass number, and its group and period numbers:
For each ionic depiction, give the name of the parent atom, its mass number, and its group and period numbers:
For each ionic depiction, give the name of the parent atom, its mass number, and its group and period numbers:
49. What is the symbol for an ion with 63 protons, 60 electrons, and 88 neutrons? If an ion contains 50 protons, 68 neutrons, and 48 electrons, what is its symbol?
What is the identity of the element X in the following ions?X2+, a cation that has 36 electrons.
Fill in the gaps in the following table, assuming each column represents a neutral atom:Symbol112CdProtons3892Neutrons5849Electrons3836Mass no.81235Complete the second row of the table.Protons3892
Fill in the gaps in the following table, assuming each column represents a neutral atom:Symbol112CdProtons3892Neutrons5849Electrons3836Mass no.81235Complete the third row of the table.Neutrons5849
What is the symbol of an ion with 16 protons, 18 neutrons, and 18 electrons? What is the symbol for an ion that has 16 protons, 16 neutrons, and 18 electrons?
Identify each of the following elements:a. a member of the same family as oxygen whose most stable ion contains 54 electrons
Identify each of the following elements:b. a member of the alkali metal family whose most stable ion contains 36 electrons
Identify each of the following elements:c. a noble gas with 18 protons in the nucleus
Identify each of the following elements:d. a halogen with 85 protons and 85 electrons
Write the following isotope in nuclide notation (e.g., " 146C")(a) oxygen-14
Write the following isotope in nuclide notation (e.g., " 146C")(b) copper-70
Write the following isotope in nuclide notation (e.g., " 146C")(c) tantalum-175
Write the following isotope in nuclide notation (e.g., " 146C")(d) francium-217
For the following isotope that have missing information, fill in the missing information to complete the notation(a) 3414 X
For the following isotope that have missing information, fill in the missing information to complete the notation(d) 12156 X
Write the nuclide notation, including charge if applicable, for atoms with the following characteristics:(a) 25 protons, 20 neutrons, 24 electrons
Write the nuclide notation, including charge if applicable, for atoms with the following characteristics:(b) 45 protons, 24 neutrons, 43 electrons
Write the nuclide notation, including charge if applicable, for atoms with the following characteristics:(c) 53 protons, 89 neutrons, 54 electrons
Write the nuclide notation, including charge if applicable, for atoms with the following characteristics:(d) 97 protons, 146 neutrons, 97 electrons
Fill in the gaps in the following table:SymbolP3-Protons3549Neutrons4566118Electrons4676Mass number31Net charge1-3+Complete the first row of the table, giving the element symbol for the ions.
Fill in the gaps in the following table:SymbolP3-Protons3549Neutrons4566118Electrons4676Mass number31Net charge1-3+Complete the second row of the table for the number of protons.
Fill in the gaps in the following table:SymbolP3-Protons3549Neutrons4566118Electrons4676Mass number31Net charge1-3+Complete the third row of the table for the number of neutrons for P3-.
Fill in the gaps in the following table:SymbolP3-Protons3549Neutrons4566118Electrons4676Mass number31Net charge1-3+Complete the fifth row of the table for the mass number.
Fill in the gaps in the following table:SymbolP3-Protons3549Neutrons4566118Electrons4676Mass number31Net charge1-3+Complete the sixth row of the table for the ion charge.
Complete the following table:
Complete the following table:
Fill in the blanks to complete the following table.SymbolIon FormedNumber of Electrons in IonNumber of Protons in IonCl__________17Te_____54_____BrBr–_______________Sr2+_____38Complete the first column of the table.
Fill in the blanks to complete the following table.SymbolIon FormedNumber of Electrons in IonNumber of Protons in IonCl__________17Te_____54_____BrBr–_______________Sr2+_____38Complete the second column of the table.
Fill in the blanks to complete the following table.SymbolIon FormedNumber of Electrons in IonNumber of Protons in IonCl__________17Te_____54_____BrBr–_______________Sr2+_____38Complete the third column of the table.
Determine whether each of the following statements is true or false. If false, correct the statement to make it true.(a) The nucleus has most of the mass and comprises most of the volume of an atom. 
(a) Define atomic number and mass number.Which of these can vary without changing the identity of the element?
Even though several elements have only one naturally occurring isotope and all atomic nuclei have whole numbers of protons and neutrons, no atomic mass is a whole number. Use the data from Table 2.2 (shown below) to explain this fact.
2.22Determine whether each of the following statements is true or false. If false, correct the statement to make it true.(b) Every atom of a given element has the same number of protons. 
2.22Determine whether each of the following statements is true or false. If false, correct the statement to make it true.(c) The number of electrons in an atom equals the number of neutrons in the atom. 
2.22Determine whether each of the following statements is true or false. If false, correct the statement to make it true.(d) The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force.
Which of the following statements about subatomic particles are true, and which are false?a. Protons and electrons have charges of the same magnitude but opposite signs.b. Protons have about the same mass as neutrons.c. Some atoms don’t have any protons.d. Protons and neutrons have charges of the same magnitude but opposite signs.
Which of the following statements is/are true? For the false statements, correct them.a. All particles in the nucleus of an atom are charged.b. The atom is best described as a uniform sphere of matter in which electrons are embedded.c. The mass of the nucleus is only a very small fraction of the mass of the entire atom.d. The volume of the nucleus is only a very small fraction of the total volume of the atom.e. The number of neutrons in a neutral atom must equal the number of electrons.
Does a cation gain protons to form a positive charge or does it lose electrons?
Write a brief description or definition of the following:(g) mass number
Write a brief description or definition of the following:(h) atomic number
Answer the following questions:Among the main subatomic particles that make up the atom, which is the most massive?
Consider an atom of 10B.How many protons, neutrons, and electrons does this atom contain?
Consider an atom of 63Cu. How many protons, neutrons, and electrons does this atom contain?
What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?a. 
What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?b. 
What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?c. 
What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?d. 
What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?e. 
What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?f. 
How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element how many electrons are present?a. 79Br
How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element how many electrons are present?b. 81Br
How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element how many electrons are present?c. 239Pu
How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element how many electrons are present?d. 133Cs
How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element how many electrons are present?e. 3H
How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element how many electrons are present?f. 56Fe
For each of the following ions, indicate the number of protons and electrons the ion contains.a. Ba2+
For each of the following ions, indicate the number of protons and electrons the ion contains.b. Zn2+
Determine the number of electrons in the Cr3+ ion.
For each of the following ions, indicate the number of protons and electrons the ion contains.c. N3-
Complete the following table.
For each of the following ions, indicate the number of protons and electrons the ion contains.d. Rb+
Complete the following table.
For each of the following ions, indicate the number of protons and electrons the ion contains.e. Co3+
How many protons, neutrons, and electrons are in each of the following atoms? 613 C
How many protons, neutrons, and electrons are in each of the following atoms?2760 Co
Draw atomic depictions similar to those in Problem 2.43 (as shown below) for :(a) 20782Pb; 
How many protons, neutrons, and electrons are in each of the following atoms? 76192 N
Draw atomic depictions similar to those in Problem 2.43 (as shown below) for(b) 7934Se; 
How many protons, neutrons, and electrons are in each of the following atoms? 58142 Ce
Draw atomic depictions similar to those in Problem 2.43 (as shown below) for(c) 115B
Draw atomic depictions similar to those in Problem 2.43 (as shown below) for(a) 20782Pb; 
Draw atomic depictions similar to those in Problem 2.43 (as shown below) for(b) 94Be; 
Draw atomic depictions similar to those in Problem 2.43 (as shown below) for(c) 7533As
For each of the following ions, indicate the number of protons and electrons the ion contains.f. Te2-
For each of the following ions, indicate the number of protons and electrons the ion contains.g. Br-
Which of these atoms has the largest number of neutrons in the nucleus?(a) 148Eu (b) 157Dy (c) 149Nd (d) 162Ho (e) 159Gd
How many protons, neutrons, and electrons are in each of the following atoms or ions?a. 
Determine the number of protons and electrons in each of the following ions.Br–
In which of the following species is the difference between the number of protons and the number of electrons largest?(a) Ti2+ (b) P3- (c) Mn (d) Se2- (e) Ce4+
How many protons, neutrons, and electrons are in each of the following atoms or ions?b. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?c. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?d. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?e. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?f. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?g. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?h. 
How many protons, neutrons, and electrons are in each of the following atoms or ions?i. 
Uranium-235 is used in nuclear fission.Determine the number of protons and the number of neutrons in uranium-235.
Determine the number of protons and electrons in each of the following.Al3 + 
Determine the number of protons and electrons in each of the following.Se2 - 
Determine the number of protons and electrons in each of the following.Ga3 + 
Determine the number of protons and electrons in each of the following.Sr2 + 
Predict the charge of the ion formed by each of the following elements.Mg
Fill in the gaps in the following table, assuming each column represents a neutral atom:Symbol112CdProtons3892Neutrons5849Electrons3836Mass no.81235Complete the fourth row of the table.Electrons3836
Fill in the gaps in the following table, assuming each column represents a neutral atom:Symbol112CdProtons3892Neutrons5849Electrons3836Mass no.81235Complete the fifth row of the table.Mass no.81235
How many protons and neutrons are present in an atom of 1939K?
Four Fe2+ ions are key components of hemoglobin, the protein that transports oxygen in the blood. Assuming that these ions are 53Fe2+, how many protons and neutrons are present in each nucleus, and how many electrons are present in each ion?
Write the following isotope in hyphenated form (e.g., “carbon-14”)(a) 2411 Na
Write the following isotope in hyphenated form (e.g., “carbon-14”)(b) 2913 Al
Write the following isotope in hyphenated form (e.g., “carbon-14”)(c) 7336 Kr
Write the following isotope in hyphenated form (e.g., “carbon-14”)(d) 19477 Ir
For the following isotope that have missing information, fill in the missing information to complete the notation(b) 36X P
For the following isotope that have missing information, fill in the missing information to complete the notation(c) 57X Mn
Exercise 21.1  Write the following isotopes in hyphenated form (e.g., “carbon-14”)(a) 2411 Na(b) 2913 Al(c) 7336 Kr(d) 19477 IrFor each of the isotopes in Exercise 21.1, determine the numbers of protons, neutrons, and electrons in a neutral atom of the isotope.
Identify each of the following elements. Give the number of protons and neutrons in each nucleus.a. 
Identify each of the following elements. Give the number of protons and neutrons in each nucleus.b. 
Identify each of the following elements. Give the number of protons and neutrons in each nucleus.c. 
Identify each of the following elements. Give the number of protons and neutrons in each nucleus.d. 
How many protons, neutrons and electrons are there in the anion  31P3–?A. 15 protons, 16 neutrons, 12 electronsB. 16 protons, 15 neutrons, 18 electronsC. 15 protons, 16 neutrons, 18 electronsD. 12 protons, 19 neutrons, 15 electronsE. 15 protons, 16 neutrons, 15 electrons
The atomic number of oxygen is 8. What is the mass number of a oxygen atom with 7 neutrons?
How many protons are in an ion with 86 electrons and a -1 charge? How many total electrons are in a Cu2+ ion? 
Some ions do not have a corresponding neutral atom that has the same electron configuration.For each of the following ions, identify the neutral atom that has the same number of electrons: CI-, Sc3+, Fe2+, Zn2+, Sn4+. 
How many protons are in an ion with 10 electrons and a -1 charge? How many total electrons are in a Sr2+ ion? 
Complete this table. Note that the atoms/ions are not necessarily neutral.
Complete the table.
For which of the following isotopes is the neutron-to-proton ratio greater than one? Choose one or more: A. carbon-12 B. chlorine-35 C. oxygen-18 D. nitrogen-14 E. sulfur-34 F. neon-20
How many protons, neutrons, and electrons are there in each of the following atoms? 
Complete this table. Note that the atoms/ions are not necessarily neutral. 
Fill in the missing information in the following table of four neutral atoms. 
What is the isotope symbol for atoms that contain the following numbers of subatomic particles? Click in the answer box to open the symbol palette. (a) 1 proton, 1 electron, and 2 neutrons (b) 4 protons, 4 electrons, and 5 neutrons (c) 15 protons, 15 electrons, and 16 neutrons
What is the charge on a hypothetical ion with 35 protons and 38 electrons? 
Be sure to answer all parts.Give the number of protons and electrons in each of the atom.Br- Mn2+ C4-
How many protons, neutrons, and electrons are there in a neutral atom of  55Fe (iron-55)?
An ion has 20 protons, 18 electrons, and a mass number of 41. Part 1 How many neutrons does this ion have? Part 2What is the symbol for this ion? Enter both the mass and the atomic number.
How many protons are in an ion with 86 electrons and a -1 charge? How many total electrons are in a Cu2+ ion?
Determine the number of protons and electrons in each of the following. N3- Enter your answers numerically separated by a comma. Ga3+ Enter your answers numerically separated by a comma. Li+ Enter your answers numerically separated by a comma.
Determine the number of protons and neutrons. Enter your answers numerically separated by a comma. 3919 K22287 Fr 9943 Tc
An ion has 14 neutrons, 10 electrons, and a mass number of 27. Part 1How many protons does this ion have? Part 2What is the symbol for this ion? Enter both the mass and the atomic number.
Which of the following best describes why atoms are inherently neutral? A. They have an equal number of charged and neutral subatomic particles B. They have neutrons C. They have an equal number of protons and electrons D. They have an equal number of protons and neutrons
Write the chemical symbols for three different atoms or atomic cations with 26 electrons.
Which of the following ions are isoelectronic with Xe? Check all that apply. a. Ba2+ b. I- c. Te2+ d. Rb+ 
A sulfur atom has a mass of 34 amu. How many neutrons does it have?a) 16b) 17c) 18d) 32e) 34
The atomic number of an atom of  80Br is _____. (a) 115 (b) 35 (c) 45 (d) 73 (e) 80
Write the symbol for 12648X. Express your answer as a chemical symbol.
Be sure to answer all parts.Part 1 of 2Do both members of the following pairs have the same number of protons? Neutrons? Electrons? 14C6 and 15N7          (i) Protons are equal. (ii) Protons are NOT equal. (iii) Neutrons are equal. (iv) Neutrons are NOT equal. (v) Electrons are equal. (vi) Electrons are NOT equal.  
Be sure to answer all parts.Part 1 of 2Do both members of the following pairs have the same number of protons? Neutrons? Electrons? 3H1 and 3He2             (i) Protons are equal. (ii) Protons are NOT equal. (iii) Neutrons are equal. (iv) Neutrons are NOT equal. (v) Electrons are equal. (vi) Electrons are NOT equal.  
Write the  AXZ  notation for the atomic depiction:
Write the  AXZ  notation for the atomic depiction:
Write the  AXZ  notation for the atomic depiction:
Be sure to answer all parts.Part 1 of 2Do both members of the following pairs have the same number of protons? Neutrons? Electrons? 19F9 and 18F9            (i) Protons are equal. (ii) Protons are NOT equal. (iii) Neutrons are equal. (iv) Neutrons are NOT equal. (v) Electrons are equal. (vi) Electrons are NOT equal.  
Which atom and/or ion is (are) isoelectronic with Br +: Se2+, Se, As–, Kr, Ga3+, Cl–?
A common of C has a mass of 12. The atomic number of C is 6. Use this information to determine the number of protons and neutrons in the nucleus. Number of protons = Number of neutrons =
Fill in the gaps in the following table, assuming each column represents a neutral atom:Symbol112CdProtons3892Neutrons5849Electrons3836Mass no.81235Complete the first row of the table.Symbol112Cd
When an atom loses one electron, the charge on its ion is___, a. 0 b. 3+ c. 2+ d. 1+
How many protons are found in 131I, used in thyroid therapy?
How many neutrons are found in 131I, used in thyroid therapy?
How many protons are found in 60Co, used in cancer therapy? 
A particular atom has 58 protons and 82 neutrons. What are the atomic number, mass number, and periodic table symbol of this isotope? Atomic number: Mass number: Periodic Table Symbol:
What symbol designates an ion that contains 13 protons and 10 electrons? (a) Ne (b) AI3+ (c) Al3- (d) P2+ 
An iron(II) ion has: (a) 24 electrons and a charge of 2+ (b) 28 electrons and a charge of 2+ (c) 28 electrons and a charge of 2- (d) 26 electrons and a charge of 2+ (e) 24 electrons and a charge of 2-
Write the symbol for each of the following ions: (a) the ion with a 3+ charge, 28 electrons, and a mass number of 71
How many protons does the As3+ ion possess?a. 30b. 36c. 8d. 33e. 4  
Write the chemical symbols for three different atoms or atomic cations with 3 electrons.
Be sure to answer all parts.One isotope of a metallic element has the mass number 65 and 35 neutrons in the nucleus. The cation derived from the isotope has 28 electrons. What is the atomic number? Write the atomic symbol for this element. What is the charge of this species?
The most likely mass number of atom with an atomic number of 5 is ___ a. 15 b. 8c. 5 d. 10
Determine the charge of each of the following ions. Part Atungsten ion with 68 electrons Enter a signed integer. For example, +2 or -1. Part Btellurium ion with 54 electrons Enter a signed integer. For example, +2 or -1. 
Fill in the gaps in the following table:SymbolP3-Protons3549Neutrons4566118Electrons4676Mass number31Net charge1-3+Complete the fourth row of the table for the number of electrons.