MCQ
Mass number is:
- ✓Neutron $+$ proton
- BNeutron $+$ electron
- CProton $+$ electron
- DNeutron $+$ proton $+$ electron
✓
Answer
Correct option: A.
Neutron $+$ proton
The mass number, also called atomic mass number, is the total number of protons and neutrons in an atomic nucleous.i.e. Mass number $=$ Neutron $+$ Proton.
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