Counter ion
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A counter ion is an ion, the presence of which allows the formation of an overall neutrally charged species. For example, in the (neutral) species NaCl the sodium ion is countered by the chloride ion and vice versa. In most situations in chemistry, an ion has a counter ion, exceptions being in ion beams, mass spectrometry and situations where electrons counter the charge of the ion (e.g. the Na/NH3 system, and plasmas).
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