Why is the value listed for atomic mass for each element on the periodic table not a whole number?
A. It is an average.
B. It is a measurement error.
C. The numbers of protons can vary for an element.
D. The number of electrons can vary for an element.
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Home » Chemistry » Why is the value listed for atomic mass for each element on the periodic table not a whole number? A. It is an average. B. It is a measurement error. C. The numbers of protons can vary for an element. D.