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Why are atomic masses of most of the ele...

Why are atomic masses of most of the elements fractional and not whole numbers?

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This is because atomic masses are the relative masses of atoms as compared with an atom of `C-12` isotope taken as 12.
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Explain why, the atomic masses of many elements are in fractions and not whole numbers.

Are the atomic masses of some elements actually fractional ?

The relative atomic masses of many elements are not whole numbers because

Statement-I : Mass numbers of most of the elements are fractional. Because Statemen-II Mass numbers are obtained by comparing with the mass number of carbon taken as 12.

Atomic mass of an element is not neccessurity a whole number because