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Mass number of a nucleus is :

  • A.Always less than its atomic number
  • B.Always more than the atomic weight
  • C.The sum of the number of protons and neutrons present in the nucleus
  • D.None of these

Answer: C

The mass number is the sum of the protons and neutrons in the nucleus.

It is always a whole number and never less than the atomic number, which counts only the protons. Atomic weight is an average over an element's natural isotopes and is usually fractional.

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