common polyatomic ions

Hg2 +2

Mercury(I)

NH4 +1

Ammonium

NO2 -1

Nitrite

NO3 -1

Nitrate

SO3 2-

Sulfite

SO4 2-

Sulfate

HSO4 1-

Hydrogen Sulfate

OH -1

Hydroxide

CN -1

Cyanide

PO4 -3

Phosphate

HPO4 2-

Hydrogen phosphate

H2PO4 -1

Dihydrogen Phosphate

NCS -1

Thiocyanate

CO3 -2

Carbonate

HCO3 -1

hydrogen carbonate

CIO -1

Hypochlorite

CIO2 -1

chlorite

CIO3 -1

Chlorate

CIO4 -1

Perchlorate

C2H3O2 -1

Acetate

MnO4 -1

permanganate

Cr2O7 -2

Dichromate

CrO4 -2

Chromate

O2 -2

Peroxide

C2O4 -2

Oxalate

S2O3 -2

Thiosulfate