Polyatomic Ions

sulfate ion

SO4 ^2-

hydrogen sulfate ion

HSO4 -

sulfite ion

SO3 ^2-

thiosulfate ion

S2O3 ^2-

nitrite ion

NO2 -

nitrate ion

NO3 -

hypochlorite ion

ClO-

chlorite ion

ClO2 -

chlorate ion

ClO3 -

perchlorate ion

ClO4 -

hydrogen phosphite ion

HPO3 ^2-

phosphate ion

PO4 ^3-

hydrogen phosphate ion

HPO4 ^2-

dihydrogen phosphate ion

H2PO ^4-

carbonate ion

CO3 ^2-

hydrogen carbonate ion or bicarbonate ion

HCO3 -

acetate ion

CH3COO - or C2H3O ^2-

cyanide ion

CN -

chromate ion

CrO4 ^2-

dichromate ion

Cr2O7 ^2-

hydroxide ion

OH -

peroxide ion

O2 ^2-

permanganate ion

MnO4 -

borate ion

BO3 ^3-

fluoride ion

F-

chloride ion

Cl-

bromide ion

Br-

iodide ion

I-

oxide ion

O2-

sulfide ion

S ^2-