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MMLU / Which statement about an atom is not true:

Problem

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question

Which statement about an atom is not true:

choices

  1. The nucleus contains most of the atom’s mass but almost none of its volume.
  2. A neutral atom always has equal numbers of electrons and protons.
  3. A neutral atom always has equal numbers of neutrons and protons.
  4. The electrons can only orbit at particular energy levels.

subject

astronomy

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Source and history

Official source

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