Atomic mass of an element is not a whole number because
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Explanation:
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.
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Answer:
Because of the existence of isotopes.
Explanation:
Because each element has various isotopes that are present in nature, and the atomic mass is an average of all of these isotope weights.
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