Polyatomic ions

Ammonium

NH₄⁺

Nitrite

NO₂^-

Nitrate

NO₃^-

Sulfite

SO₃^2-

Sulfate

SO₄^2-

Hydrogen sulfate, bisulfate

HSO₄^-

Hydroxide

OH^-

Cyanide

CN^-

Phosphate

PO₄^3-

Hydrogen phosphate

HPO₄^2-

Dihydrogen phosphate

H₂PO₄^-

Carbonate

CO₃^2-

Hydrogen carbonate, bicarbonate

HCO₃^-

Acetate

CH₃COO^-

Permanganate

MnO₄^-

Dichromate

Cr₂O₇^2-

Chromate

CrO₄^2-

Peroxide

O₂^2-

Hypochlorite

ClO^-

Chlorite

ClO₂^-

Chlorate

ClO₃^-

Perchlorate

ClO₄^-