In physics and chemistry, an ion is an atom or molecule with a net electric charge.

Ion or ION may also refer to:

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Ancient Greece edit

  • Ion (dialogue), a dialogue by Plato, between Socrates and Ion, a reciter of epic poems
  • Ion (mythology), the son of Xuthus and Creüsa, daughter of Erechtheus
  • Ion (play), a play by Euripides on the relationship between humans and the gods, in which Ion is instead the son of Apollo

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