polyatomic ions

hydronium

hydronium

H3O 1+

thiocyanate

SCN 1-

hypochlorite

ClO 1-

bromite

BrO2 1-

bromate

BrO3 1-

nitrite

NO2 1-

nitrate

NO3 1-

permanganate

MnO4 1-

dihydrogen phosphate

H2PO4 1-

hydrogen carbonate

HCO3 1-

ammonium

NH4 1+

ammonia

NH3 1+

Mercury(I)

Hg2 2+

acetate

C2H3O2 1-

azide

N3 1-

cyanide

CN 1-

hydroxide

OH 1-

perchlorate

ClO4 1-

chlorite

ClO2 1-

chlorate

ClO3 1-

iodite

IO2 1-

iodate

IO3 1-

hydrogen sulfate

HSO4 1-

carbonate

CO3 2-

chromate

CrO4 2-

dichromate

Cr2O7 2-

hydrogen phosphate

HPO4 2-

oxalate

C2O4 2-

peroxide

O2 2-

sulfite

SO3 2-

sulfate

SO4 2-

phosphite

PO3 3-

phosphate

PO4 3-