The mass number of a nucleus is

Asked in BPSC Prelims Exam 67th Cancelled · Topic: Nuclear Physics (Basic properties of nuclei: size, shape, charge, mass, spin, magnetic dipole and electric quadrupole moments.)

1. the sum of the numbers of neutrons and protons
2. the total mass of neutrons and protons
3. always more than the atomic weight
4. always less than its atomic number

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