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(ion of a nitrogen atom and two oxygen atoms with extra electron)

The term nitrite (NO2-) is used for the compound nitrogen dioxide (NO2) when singly ionized (one extra electron). NO2 is a compound with molecules each consisting of one nitrogen and two oxygen atoms.

The term nitrite is also used to indicate a compound that includes the ion, presumably with an ionic bond, resulting in a nitrite salt. Examples include or sodium or potassium atom(s).

The presence of nitrite ions is indicated by the spectra of some astrophysical objects and some nitrite compounds may be biosignatures.