Polyatomic Ions

Must memorize

NH₄⁺

Ammonium

Hg₂²⁺

Mercury(I)

C₂H₃O₂^- (also written CH₃CO₂^-)

Acetate

CN^-

Cyanide

OCN^-

Cyanate

SCN^-

Thiocyanate

HCO₃^-

Hydrogen carbonate (bicarbonate)

CO₃^2-

Carbonate

ClO^-

Hypochlorite

ClO₂^-

Chlorite

ClO₃^-

Chlorate

ClO₄^-

Perchlorate

CrO₄^2-

Chromate

Cr₂O₇^2-

Dichromate

MnO₄^-

Permanganate

NO₂^-

Nitrite

NO₃^-

Nitrate

OH^-

Hydroxide

O₂^2-

Peroxide

H₂PO₄^-

Dihydrogen phosphate

HPO₄^2-

Hydrogen phosphate

PO₄^3-

Phosphate

SO₃^2-

Sulfite

HSO₄^-

Hydrogen sulfate (bisulfate)

SO₄^2-

Sulfate

C₂O₄^2-

Oxalate