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Isotopes Solutions Library

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304 solutions

Isotopes

Q. Part C.Using the PhET simulation as a reference, determine whether the following combinations of protons and neutrons form stable or unstable nucle...

Solved • Jul 1, 2020

Isotopes

Q. Part E. Give the nuclear symbol for the isotope of beryllium for which A = 10?Enter the nuclear symbol for the isotope (e.g., 42He).The atomic numb...

Solved • Jul 1, 2020

Isotopes

Q. Part D. Which element does X represent in the following expression: 3215X?Enter the chemical symbol of the element. Atoms are composed of three fun...

Solved • Jul 1, 2020

Isotopes

Q. Part 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).Atom...

Solved • Jul 1, 2020

Isotopes

Q. Part C.  Rank the following hydrogen peroxide molecules from the highest to lowest mass.Rank from highest to lowest molecular mass. To rank items a...

Solved • Jul 1, 2020

Isotopes

Q. Part B. The water found on Earth is almost entirely made up of the 1H and 16O isotopes for a formula of H2O and a molecular mass of 18.0 amu. What ...

Solved • Jul 1, 2020

Isotopes

Q. Part A. Which of the following water molecules exists in the greatest abundance? There are three naturally occurring isotopes of hydrogen:protium (...

Solved • Jul 1, 2020

Isotopes

Q. In the PhET simulation, click on the Mixtures tab. Select Mg from the periodic table. Drag the colored spheres representing the different isotopes ...

Solved • Jul 1, 2020

Isotopes

Q. Click on the Mixtures tab in the PhET simulation. Click on yellow cells in the periodic table shown in the upper right to select an element. You ca...

Solved • Jul 1, 2020

Isotopes

Q. What is the relative atomic mass of the element that consists of the following isotopes in the indicated natural abundances?Express your answer to ...

Solved • Jun 30, 2020

Isotopes

Q. What is the relative atomic mass of a hypothetical element that consists of the following isotopes in the indicated natural abundances?Express your...

Solved • Jun 30, 2020

Isotopes

Q. The two isotopes of chlorine are 3517Cl and 3717Cl. Which isotope is the most abundant?Atomic mass Since the number of neutrons varies in the perio...

Solved • Jun 30, 2020

Isotopes

Q. What is the identity of element X from Part B? Express your answer as a chemical symbol.Atomic mass Since the number of neutrons varies in the peri...

Solved • Jun 30, 2020

Isotopes

Q. A certain element X has four isotopes. 0.5600% of X has a mass of 83.91343 amu. 9.860% of X has a mass of 85.90927 amu. 7.000% of X has a mass of 8...

Solved • Jun 30, 2020

Isotopes

Q. The atomic weight of copper, Cu, is listed as 63.546. Which of the following statements are untrue:Check all that apply.a. All the copper atoms hav...

Solved • Jun 30, 2020

Isotopes

Q. What are the differences in the compositions of the following pairs of atomic nuclei? 2210Ne , 3818Ara) 3818Ar has eight more protons and eight mor...

Solved • Jun 30, 2020

Isotopes

Q. What are the differences in the compositions of the following pairs of atomic nuclei? 147N, 158OA) 158O has the same number of protons and the same...

Solved • Jun 29, 2020

Isotopes

Q. Which of the following pairs of atoms are isotopes of one another?54Fe, 55Fe

Solved • Jun 29, 2020

Isotopes

Q. Which of the following pairs of atoms are isotopes of one another?11B, 11C

Solved • Jun 29, 2020

Isotopes

Q. Determine the isotope symbol that fits each description. a. 68 neutrons, 47 electrons b. mass number = 197, 79 electrons c. atomic number = 86, 136...

Solved • Jun 17, 2020

Isotopes

Q. Radioisotopes taken internally for medical reasonsa.  must be eliminated from the body slowlyb.  should be fissionable isotopesc.  are usually depo...

Solved • Jun 16, 2020

Isotopes

Q. Magnesium has three naturally occurring isotopes Mg-24, Mg-25, and Mg-26). The atomic mass and natural abundance of Mg-24 are 23.9850 amu and 79 %....

Solved • May 1, 2020

Isotopes

Q. A certain element X has four isotopes. • 5.845% of X has a mass of 53.93961 amu. • 91.75% of X has a mass of 55.93494 amu. • 2.123% of X has a mass...

Solved • Apr 28, 2020

Isotopes

Q. What are the atomic number, mass number, and symbol for the carbon isotope with 7 neutrons?

Solved • Apr 28, 2020

Isotopes

Q. The naturally occurring isotopes of element X consists of the isotopes 63X, and 65X. The atomic mass of 63X is 62.9396 amu with a percent abundance...

Solved • Nov 28, 2019

Isotopes

Q. Rubidium has two isotopes, rubidium-85 and rubidium-87. The atomic weight of rubidium is 85.4678 amu. If the atomic weight of rubidium-85 is 84.911...

Solved • Nov 25, 2019

Isotopes

Q. An unknown element with atomic weight 125.8 amu has two isotopes. One isotope has an abundance of 51.97% at 125.6 amu. Find the mass of the second ...

Solved • Oct 3, 2019

Isotopes

Q. Three isotopes of A (Isotope 1: 85.91 amu, 35.12%, Isotope 2: 86.91 amu, abundance 7%, Isotope 3: 87.91 amu) would have the atomic mass of what?

Solved • Sep 18, 2019

Isotopes

Q. How many protons, neutrons and electrons does the 56Fe2+ ion have?

Solved • Sep 18, 2019

Isotopes

Q. There are two isotopes of Y, 50Y (mass 49.972 amu, abundance 24.93%), 52Y (mass 51.966 amu). The atomic mass of Y in amu is what?

Solved • Sep 18, 2019

Isotopes

Q. Pretend that a new element named Szulczewskium (Sz) has been discovered. It is found to have three naturally occurring isotopes. Use the informatio...

Solved • Sep 17, 2019

Isotopes

Q. What are the numbers of electrons, sequentially, in each of the following ions?    Ca2+, Fe2+, I-, O2-       a) 20e-, 26e-, 53e-, 8e-b) 18e-, 26e-,...

Solved • Sep 14, 2019

Isotopes

Q. Which of the following pairs represent (hypothetical) isotopes? A) A and BB) A and CC) A and DD) C and D

Solved • Sep 12, 2019

Isotopes

Q. Pretend that a new element with an atomic weight of 342.38 amu was recently discovered. This element has two isotopes, the lighter of which has a m...

Solved • Sep 12, 2019

Isotopes

Q. How many neutrons are present in an atom of neon isotope, Ne-22? (atomic # 10)

Solved • Sep 4, 2019

Isotopes

Q. If there are 128 neutrons in Pb-210, how many neutrons are found in the nucleus of Pb-206?

Solved • Sep 4, 2019

Isotopes

Q. Which of the following sets represents a pair of isotopes? 14C and 14N 206Pb and 208Pb O2 and O3 32S and 32S2-

Solved • Aug 29, 2019

Isotopes

Q. What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?

Solved • Aug 26, 2019

Isotopes

Q. What is the difference between Carbon 12, 13, and 14?

Solved • Aug 8, 2019

Isotopes

Q. A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?

Solved • Aug 7, 2019

Isotopes

Q. Gallium consists of 2 isotopes. One of those isotopes is Ga-71 with a mass of 70.92 amu with an abundance of 39.892%. What is the mass number of th...

Solved • Aug 7, 2019

Isotopes

Q. The mass number of common krypton is 84, and its atomic number is 36. Krypton-84 has how many neutrons within each isotope?

Solved • Aug 7, 2019

Isotopes

Q. What is the average atomic mass of silicon? Given the following data, calculate the average atomic mass of silicon.isotope = Si-28amu =27.9769abund...

Solved • Aug 7, 2019

Isotopes

Q. How many electrons, protons, and neutrons does nitrogen-14 have? Is it an anion or cation?

Solved • Aug 7, 2019

Isotopes

Q. Chorline exists mainly as two isotopes 35Cl and 37Cl,a) Which is more abundant?b) How do you know?c) Compute the percentage of chlorine that is the...

Solved • Aug 5, 2019

Isotopes

Q. The two naturally occurring isotopes of bromine are 81Br (80.916 amu, 49.31%) and 79Br (78.918 amu, 50.69%). The two naturally occurring isotopes o...

Solved • Aug 5, 2019

Isotopes

Q. Which of the following water molecules exists in the greatest abundance?a. D217Ob. H218Oc. T218Od. H216Oe. D216Of. T217O

Solved • Jul 10, 2019

Isotopes

Q. The table below gives the number of protons (p) and neutrons (n) for four isotopes. (i) (ii) (iii) (iv) ...

Solved • Jan 8, 2019

Isotopes

Q. The table below gives the number of protons (p) and neutrons (n) for four isotopes.(i)(ii)(iii)(iv)p19192020n19211920Write the symbol for the isoto...

Solved • Jan 8, 2019

Isotopes

Q. Indicate the number of protons and neutrons in the following nuclei.193 Tl

Solved • Jan 8, 2019

Isotopes

Q. Indicate the number of protons and neutrons in the following nuclei.The number of protons in the nuclide 12953I

Solved • Jan 8, 2019

Isotopes

Q. A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutrons. The element forms 12 charged ions...

Solved • Nov 26, 2018

Isotopes

Q. Write symbols for the following isotopes.Z = 58 and A = 140

Solved • Oct 25, 2018

Isotopes

Q. The radioactive isotope cesium-137 was produced in large amounts in fallout from the 1986 nuclear power-plant disaster at Chernobyl, Ukraine.Write ...

Solved • Oct 25, 2018

Isotopes

Q. Germanium has five naturally occurring isotopes: 70 Ge, 20.5%, 69.924 amu; 72 Ge, 27.4%, 71.922 amu; 73 Ge, 7.8%, 72.923 amu; 74 Ge, 36.5%, 73.921 ...

Solved • Oct 25, 2018

Isotopes

Q. Hydrogen has three isotopes (1H, 2H, and 3H), and chlorine has two isotopes (35Cl and 37Cl).Tell how many protons, neutrons, and electrons 1H35Cl c...

Solved • Oct 25, 2018

Isotopes

Q. Naturally occurring boron consists of two isotopes: 10B (19.9%) with an isotopic mass of 10.0129 amu and 11B (80.1%) with an isotopic mass of 11.00...

Solved • Oct 25, 2018

Isotopes

Q. Naturally occurring silver consists of two isotopes: 107Ag (51.84%) with an isotopic mass of 106.9051 amu and 109Ag (48.16%) with an isotopic mass ...

Solved • Oct 25, 2018

Isotopes

Q. Magnesium has three naturally occurring isotopes: 24 Mg (23.985 amu) with 78.99% abundance, 25 Mg (24.986 amu) with 10.00% abundance, and a third w...

Solved • Oct 25, 2018

Isotopes

Q. The isotope 3475 Se is used medically for the diagnosis of pancreatic disorders.How many protons, electrons, and neutrons does an atom of 3475 Se h...

Solved • Oct 25, 2018

Isotopes

Q. Sulfur has four naturally occurring isotopes, including 33S, 34S, and 36S. Look at the periodic table, and tell whether the fourth isotope is 32S o...

Solved • Oct 25, 2018

Isotopes

Q. Copper metal has two naturally occurring isotopes: copper-63 (69.15%; isotopic mass = 62.93) and copper-65 (30.85%; isotopic mass = 64.93). Calcula...

Solved • Oct 25, 2018

Isotopes

Q. Gallium has two naturally occurring isotopes: gallium-69 (isotopic mass = 68.926 amu) and gallium-71 (isotopic mass = 70.925 amu). The atomic weigh...

Solved • Oct 25, 2018

Isotopes

Q. Consider an atom of 10B.(b) What is the symbol of the atom obtained by adding one proton to 10B?(c) What is the symbol of the atom obtained by addi...

Solved • Oct 25, 2018

Isotopes

Q. The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear dete...

Solved • Oct 25, 2018

Isotopes

Q. The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear dete...

Solved • Oct 25, 2018

Isotopes

Q. The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear dete...

Solved • Oct 25, 2018

Isotopes

Q. The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear dete...

Solved • Oct 25, 2018

Isotopes

Q. The nucleus of 6Li is a powerful absorber of neutrons. It exists in the naturally occurring metal to the extent of 7.5%. In the era of nuclear dete...

Solved • Oct 25, 2018

Isotopes

Q. The explosion of an atomic bomb releases many radioactive isotopes, including strontium-90. Considering the location of strontium in the periodic t...

Solved • Oct 25, 2018

Isotopes

Q. Write the correct symbol, with both superscript and subscript, for each of the following. Use the list of elements inside the front cover as needed...

Solved • Oct 25, 2018

Isotopes

Q. Write the correct symbol, with both superscript and subscript, for each of the following. Use the list of elements inside the front cover as needed...

Solved • Oct 25, 2018

Isotopes

Q. Write the correct symbol, with both superscript and subscript, for each of the following. Use the list of elements inside the front cover as needed...

Solved • Oct 25, 2018

Isotopes

Q. Write the correct symbol, with both superscript and subscript, for each of the following. Use the list of elements inside the front cover as needed...

Solved • Oct 25, 2018

Isotopes

Q. The first atoms of seaborgium (Sg) were identified in 1974. The longest-lived isotope of Sg has a mass number of 266.How many protons, electrons, a...

Solved • Oct 25, 2018

Isotopes

Q. The element oxygen has three naturally occurring isotopes, with 8, 9, and 10 neutrons in the nucleus, respectively.Write the full chemical symbols ...

Solved • Oct 25, 2018

Isotopes

Q. The element oxygen has three naturally occurring isotopes, with 8, 9, and 10 neutrons in the nucleus, respectively.Describe the similarities and di...

Solved • Oct 25, 2018

Isotopes

Q. The element lead (Pb) consists of four naturally occurring isotopes with atomic masses 203.97302, 205.97444, 206.97587, and 207.97663 amu. The rela...

Solved • Oct 25, 2018

Isotopes

Q. Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu.Write the complete atomic symbol for each, showing t...

Solved • Oct 25, 2018

Isotopes

Q. Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu.The average atomic mass of Ga is 69.72 amu. Calculat...

Solved • Oct 25, 2018

Isotopes

Q. Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu.How many protons and neutrons are in the nucleus of ...

Solved • Oct 25, 2018

Isotopes

Q. Gallium (Ga) consists of two naturally occurring isotopes with masses of 68.926 and 70.925 amu.How many protons and neutrons are in the nucleus of ...

Solved • Oct 25, 2018

Isotopes

Q. Using a suitable reference such as the CRC Handbook of Chemistry and Physics  or http://www.webelements.com, look up the following information for ...

Solved • Oct 25, 2018

Isotopes

Q. Using a suitable reference such as the CRC Handbook of Chemistry and Physics  or http://www.webelements.com, look up the following information for ...

Solved • Oct 25, 2018

Isotopes

Q. The natural abundance of 3 He is 0.000137 %.How many protons, neutrons, and electrons are in an atom of 3 He?

Solved • Oct 25, 2018

Isotopes

Q. The natural abundance of 3 He is 0.000137 %.Based on the sum of the masses of their subatomic particles, which is expected to be more massive, an a...

Solved • Oct 25, 2018

Isotopes

Q. Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope.thallium-201

Solved • Oct 25, 2018

Isotopes

Q. One way in which Earths evolution as a planet can be understood is by measuring the amounts of certain isotopes in rocks. One quantity recently mea...

Solved • Oct 25, 2018

Isotopes

Q. One way in which Earths evolution as a planet can be understood is by measuring the amounts of certain isotopes in rocks. One quantity recently mea...

Solved • Oct 25, 2018

Isotopes

Q. What isotope is used as the standard in establishing the atomic mass scale?

Solved • Oct 25, 2018

Isotopes

Q. The atomic weight of boron is reported as 10.81, yet no atom of boron has the mass of 10.81 amu. Explain.

Solved • Oct 25, 2018

Isotopes

Q. What is the mass in amu of a carbon-12 atom?

Solved • Oct 25, 2018

Isotopes

Q. Complete the sentence to explain why the atomic weight of carbon is reported as 12.011 in the table of elements and the periodic table in the front...

Solved • Oct 25, 2018

Isotopes

Q. Only two isotopes of copper occur naturally, 63 Cu (atomic mass = 62.9296  amu; abundance 69.17 %) and 65 Cu (atomic mass = 64.9278  amu; abundance...

Solved • Oct 25, 2018

Isotopes

Q. Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium-87 (atomic mass = 86.9092 a...

Solved • Oct 25, 2018

Isotopes

Q. Naturally occurring magnesium has the following isotopic abundances:IsotopeAbundance Atomic mass (amu) 24 Mg78.99%23.9850425 Mg10.00%24.9858426 Mg1...

Solved • Oct 25, 2018

Isotopes

Q. Which two of the following are isotopes of the same element: 1631 X,1531 X,1632 X?

Solved • Oct 25, 2018

Isotopes

Q. (a) Which two of the following are isotopes of the same element: 3116X, 3115X, 3216X?What is the identity of the element whose isotopes you have se...

Solved • Oct 25, 2018

Isotopes

Q. Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope.phosphorus-32

Solved • Oct 25, 2018

Isotopes

Q. Each of the following isotopes is used in medicine. Indicate the number of protons and neutrons in each isotope.chromium-51

Solved • Oct 25, 2018