Q.

The mass number of a nucleus is –

A. always less than its atomic number
B. always more than its atomic number
C. always equal to its atomic number
D. sometimes more - and somtimes equal to its atomic number
Answer» D. sometimes more - and somtimes equal to its atomic number
Explanation: Mass number = protons or mass of electron (atomic number) + neutrons. So it is mostly greater than the atomic number. At best, it can be equal to the atomic number.
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