An element has two different isotopes: one that weighs 65 amu and another that weighs 67 amu. If the average atomic mass of all the isotopes is 66.5 amu, what can be said about the relative abundance of the isotopes?
A. All the isotopes have the same relative abundance.
B. The isotope with the mass of 66.5 is more abundant than the isotope with the mass of 67.
C. The isotope with the mass of 66.5 is more abundant than the isotope with the mass of 65.
D. The isotope with the mass of 67 is more abundant than the isotope with the mass of 65.
E. The isotope with the mass of 65 is more abundant than the isotope with the mass of 67.
Answer: D
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