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Question

Atomic mass of an element is equal to the sum of?


  1. Electron and neutron

  2. Electron and proton

  3. All the neutrons
  4. Proton and neutron


Solution

The correct option is D

Proton and neutron


Atomic mass of an element is equal to the sum of the number of protons and neutrons. The mass of an electron is not considered here as it has negligible mass when compared to a proton or neutron.

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