Mass Number is the Sum of:

  1. Electrons and Protons
  2. Protons and neutrons
  3. Electron and neutrons
  4. Only ptotons
Anurag Mishra Professor Asked on 1st November 2015 in General Knowledge.
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Answer: (2) Protons and neutrons

Anurag Mishra Professor Answered on 2nd November 2015.
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