An atom (or group of atoms) which has either gained or lost electrons

e.g., a chloride anion, 17Cl1-, contains 18 electrons (i.e., one more than neutral atom, 17Cl0), and a copper(II) cation, 29Cu2+, contains 27 electrons (i.e., two less than the neutral atom, 29Cu0).


An atom or molecule with missing electrons that has a net positive charge.


An atom with extra electrons that has a net negative charge.

See also: Anion, Cations, Coulombic Force, Ion Exchange Resin, Ion Trap, Ionic Liquid, Ionic Strength, Ionization, Monatomic Ion, Nuclide, Plasma, Polyatomic Ion, Recombination.

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Subjects: Chemistry Physics