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Atoms are composed of:

  • A.Electrons and protons
  • B.Electrons only
  • C.Protons only
  • D.Electrons and nuclei

Answer: D

An atom consists of electrons and a nucleus. The nucleus holds the protons and neutrons and nearly all the mass; the electrons occupy the space around it.

Rutherford's gold-foil experiment showed that the positive charge and the mass are concentrated in a nucleus about 10,000 times smaller than the atom itself.

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