Question

Why do most Elements have Atomic Masses as Fractions and not as Whole Numbers?
(2 Marks)

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Answer 1

Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes. Being an average it would be most unlikely to be a whole number. The mass of an individual atom in atomic mass units is the mass relative to carbon-12.