Question

The mass number of a nucleus is
A.always less than its atomic number
B.the sum of the number of protons and neutrons present in the nucleus
C.always more than the atomic weight
D.a fraction

Answer 1

the mass number is the sum of the number of protons and neutrons in nucleus .

Answer 2

The mass number of nucleus or also called atomic mass number is...B. The sum of the number of protons and neutrons present in the nucleus...

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