Ch.2 - Atoms & ElementsSee 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) : ______
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.
A substance that can't be chemically broken down into simpler substances is A) a homogeneous mixture. B) an element. C) a heterogeneous mixture. D) a compound. E) an electron.
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+
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
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 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 the nucleus plus the number of electrons outside. (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.
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
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
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.  
How many protons, neutrons and electrons are there in the anion  31P3–? A. 15 protons, 16 neutrons, 12 electrons B. 16 protons, 15 neutrons, 18 electrons C. 15 protons, 16 neutrons, 18 electrons D. 12 protons, 19 neutrons, 15 electrons E. 15 protons, 16 neutrons, 15 electrons
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.
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.
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:
Fill in the gaps in the following table:
Complete the following table:
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
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.
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
What is the modern view of the structure of the atom?
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.
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 atomic number of oxygen is 8. What is the mass number of a oxygen atom with 7 neutrons?
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
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___
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.
Specify the number of protons, neutrons, and electrons in the neutral atom iron-56. Enter your answers as integers separated by commas. 
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+. Express your answers as chemical symbols separated by commas.
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. To add the superscript to the Symbols highlight the number, and then use the Xy key to superscript. 
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.
A sulfur atom has a mass of 34 amu. How many neutrons does it have?
The atomic number of an atom of  80Br is _____. (a) 115 (b) 35 (c) 45 (d) 73 (e) 80
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.  
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 =
When an atom loses one electron, the charge on its ion is___, a. 0 b. 3+ c. 2+ d. 1+
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:
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-
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. 
What element forms an ion with an electronic configuration of [Xe] and a -2 charge? Give the symbol for the element.