Common Polyatomic Ions

Diammine silver (I) Ag(NH₃)₂⁺

Mercury (I) Hg₂²⁺

Ammonium NH₄⁺

Arsenite AsO₃^3-

Arsenate AsO₄^3-

Borate BO₃^3-

Acetate C₂H₃O₂^-

CH₃COO^-

Cyanide CN^-

Carbonate CO₃^2-

Hydrogen carbonate HCO₃^-

Oxalate C₂O₄^2-

Hypochlorite ClO^-

Chlorite ClO₂^-

Chlorate ClO₃^-

Perchlorate ClO₄^-

Chromate CrO₄^2-

Dichromate Cr₂O₇^2-

Hexacyanoferrate (III) Fe(CN)₆^3-

Hexacyanoferrate (II) Fe(CN)₆^4-

Permanganate MnO₄^-

Manganate MnO₄^2-

Molybdate MoO₄^2-

Amide NH₂^-

Nitrite NO₂^-

Nitrate NO₃^-

Peroxide O₂^2-

Hydroxide OH^-

Phosphate PO₄^3-

Hydrogen phosphate HPO₄^2-

Dihydrogen phosphate H₂PO₄^-

Thiocyanate SCN^-

Sulfite SO₃^2-

Hydrogen sulfite HSO₃^-

Sulfate SO₄^2-

Hydrogen sulfate HSO₄^-

Thiosulfate S₂O₃^2-