is a functional group
consisting of oxygen
It has a charge (oxidation number) of -1 unit.
The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. Organic molecules containing a hydroxyl group are known as alcohols.
Hydroxide is one of the simplest of the polyatomic ions.
a general term for any salt containing stoichiometric amounts of this polyatomic ion.