Polyatomic Ions

Hg₂²⁺

Mercury(I)

NCS^- or SCN^-

Thiocyanate

NH₄⁺

Ammonium

CO₃^2-

Carbonate

NO₂^-

Nitrite

HCO₃^-

Hydrogen carbonate or Bicarbonate

NO₃^-

Nitrate

ClO^- or OCl^-

Hypochlorite

SO₃^2-

Sulfite

ClO₂^-

Chlorite

SO₄^2-

Sulfate

ClO₃^-

Chlorate

HSO₄^-

Hydrogen sulfate

ClO₄^-

Perchlorate

OH^-

Hydroxide

C₂H₃O₂^-

Acetate

CN^-

Cyanide

MnO₄^-

Permanganate

PO₄^3-

Phosphate

Cr₂O₇^2-

Dichromate

HPO₄^2-

Hydrogen phosphate

CrO₄^2-

Chromate

H₂PO₄^-

Dihydrogen phosphate

O₂^2-

Peroxide

C₂O₄^2-

Oxalate

S₂O₃^2-

Thiosulfate