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19 May, 04:39

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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Answers (1)
  1. 19 May, 05:46
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    A. it is an average
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