n.
Atom or group of atoms carrying a negative electric charge , indicated by a superscript minus sign after the chemical symbol.
Anions in a liquid subjected to an electric field migrate toward the positive electrode ( anode ). Examples include hydroxyl ( 2015; OH - ; see hydroxide ), carbonate ( 2015; CO 3 2- ), and phosphate ( 2015; PO 4 3- ). See also ion ; Compare cation .