To go from a paired to a non-paired state; to disassociate.

not forming one of a pair

simple past tense and past participle of unpair

Third-person singular simple present indicative form of unpair

present participle of unpair

Incapable of being paired with something else.

(chemistry, physics) An electron, in an atomic orbital, for which there is no other electron in the same orbital but with opposite spin; a characteristic of free radicals and other reactive species

plural of unpaired electron