polyatomic ions

Ammonium ion

Ammonium ion

NH4 +

Hydronium ion

H3O +

Acetate ion

C2H3O2 -

Cyanide ion

CN -

Carbonate ion

CO3 2-

Hydrogen carbonate/bicarbonate ion

HCO3 -

Bromate ion

BrO3 -

Perchlorate ion

ClO4 -

Chlorate ion

ClO3 -

Chlorite ion

ClO2 -

Hypochlorite ion

ClO -

Chromate ion

CrO4 2-

Dichromate ion

Cr2O7 2-

Hydroxide ion

OH -

Peroxide ion

O2 2-

Iodate ion

IO3 -

Nitrate ion

NO3 -

Nitrite ion

NO2 -

Permanganate ion

MnO4 -

Phosphate ion

PO4 3-

Phosphite ion

PO3 3-

Sulfate ion

SO4 2-

Sulfite ion

SO3 2-