Question

atom mass number is whole number?

Answer 1

No atom mass no. is not whole no.

Answer 2

No atom mass is not a whole number.

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 occurring 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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