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The nucleus of an atom contains

  • A.Protons
  • B.Electrons
  • C.Protons and neutrons
  • D.Electrons and protons

Answer: C

The nucleus contains protons and neutrons.

These are the nucleons, and they hold virtually the whole mass of the atom in a volume about \(10^{-15}\) m across. The electrons occupy the space outside the nucleus, which is why the atom as a whole is some hundred thousand times larger.

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