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Hydroxide is a polyatomic ion consisting of oxygen and hydrogen:
It has a charge of −1. Hydroxide is one of the simplest of the polyatomic ions.
The term hydroxyl group is used to describe the functional group -OH when it is a substituent in an organic compound. Organic molecules containing a hydroxyl group are known as alcohols (the simplest of which have the formula CnH2n+1-OH).