Polyatomic Ion
Group of atoms with a charge.
ammonium
NH4+
hydronium
H3O+
peroxide
O2(2-)
hydroxide
OH-
acetate
CH3COO-
acetic acid (ethanoic acid)
CH3COOH
cyanide
CN-
hydrocyanic acid
HCN
azide
N3-
hydrazoic acid
HN3
carbonate
CO3(2-)
carbonic acid
H2CO3
bicarbonate
HCO3-
nitrate
NO3-
nitric acid
HNO3
nitrite
NO2-
nitrous acid
HNO2
sulfate
SO4(2-)
sulfuric acid
H2SO4
hydrogen sulfate
HSO4-
sulfite
SO3(2-)
sulfurous acid
H2SO3
hydrogen sulfite
HSO3-