# The stick diagram for molybdenum looks lilke this: MS for Mo 1.How many isotopes does Mo have? 2.Write symbol for each isotope. 3.Which isotope is most.

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The stick diagram for molybdenum looks lilke this: MS for Mo 1.How many isotopes does Mo have? 2.Write symbol for each isotope. 3.Which isotope is most abundant? 4.Which is least abundant? 5.How would you use this data to determine the atomic mass of Mo?

Carbon has 3 naturally occurring isotopes (15 total) From the data, what would you expect the MS diagram to look like for C? C-12 98.9% C-13 1.08% C-14 0.02%

MS of Cl 1.What are the approximate mass numbers of the two isotopes of Cl? 2.What is the approximate % abundance of the lighter isotope? 3.How many types of molecules, with different masses, exist in a sample of chlorine gas if the sample exists entirely as diatomic molecules? Explain your answer. 4.How many neutrons does the less abundant chlorine atom have? 5.The actual masses of the two isotopes are 34.969 amu and 36.966 amu. Why are they not integers? a. Atomic mass of an element is the average mass of all isotopes. b. The masses of a proton and a neutron are not integers. c. The number of neutrons in an individual isotope equals mass number minus the number of protons. d. Atomic mass of an element is the sum of the number of protons and neutrons in an atom.

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