Q96 / 270 · NDA 2020 · General Ability

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

  • Correct answer
    A
    electrons and protons only
  • B
    protons and neutrons only
  • C
    electrons and neutrons only
  • D
    electrons, protons and neutrons

Solution

Mass number is equal to the sum of number of protons and neutrons in it. Atomic mass is the mass of that element. Atomic mass may be very close to its mass number, but both are not the same and are different.

Hence, the correct answer is option: 'A'.

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