Polyatomic Ions

Acetate ion

C₂H₃O₂

Carbonate ion

CO₃^2-

Hydrogen carbonate ion

HCO₃^-

Hydroxide ion

OH^-

Nitrite ion

NO₂^-

Nitrate ion

NO₃^-

Chromate ion

CrO₄^2-

Dichromate ion

Cr₂O₇^2-

Phosphate ion

PO₄^3-

Hydrogen phosphate ion

HPO₄^2-

Dihydrogen phosphate ion

H₂PO₄^-

Ammonium ion

NH₄⁺

Hypochlorite ion

ClO^-

Chlorite ion

ClO₂^-

Chlorate ion

ClO₃^-

Perchlorate ion

ClO₄^-

Permanganate ion

MnO₄^-

Sulfite ion

SO₃^2-

Hydrogen sulfite ion

HSO₃^-

Sulfate ion

SO₄^2-

Hydrogen sulfate ion

HSO₄^-

Cyanide ion

CN^-

Peroxide ion

O₂^2-