Atom or group of atoms carrying a positive electric charge, indicated by a superscript plus sign after the chemical symbol. Cations in a liquid subjected to an electric field collect at the negative pole (cathode). Examples include sodium (Na+), calcium (Ca2+), and ammonium (NH+; see ammonia). See also ion; compare anion.
This entry comes from Encyclopædia Britannica Concise.For the full entry on cation, visit Britannica.com.
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