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The mass number of an atom is equal to

  • A.The number of protons
  • B.The number of protons and electrons
  • C.The number of nucleons
  • D.The number of neutrons

Answer: C

The mass number equals the number of nucleons.

Nucleons are the protons and neutrons taken together, so \[A = Z + N\] where \(Z\) is the number of protons and \(N\) the number of neutrons. Electrons weigh too little to matter.

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