Question

atomic mass number is a whole number give scientific reason

Answer 1

Atomic mass is never an integer number for several reasons: Theatomic 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-

Answer 2

atomic no. is a whole no.

_reason_
atomic no. is sum of no. of protons and electrons

so neither protons r in rational or decimal form nor electrons

hence they r whole numbers

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