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ARC-Easy / Mercury_7041913 / A positively-charged hydrogen ion has a much smaller radius than a neutral…

Problem

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question

A positively-charged hydrogen ion has a much smaller radius than a neutral hydrogen atom. Which best explains this difference?

choices

  • The nucleus is the least dense region of an atom.
  • Electrons are located far from the nuclei of their atoms.
  • Most of the volume of atoms is filled with the particles they contain.
  • The repulsion of protons and neutrons keeps them on opposite ends of atoms.

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Source and history

Official source

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