Polyatomic anions

acetate

C₂H₃O₂

arsenate

AsO₄^3-

bicarbonate

HCO₃

bisulfate

HSO₄

borate

BO₃^3-

bromate

BrO₃^-

carbonate

CO₃^2-

chromate

CrO₄^2-

chlorate

ClO₃^-

dichromate

Cr₂O₇^2-

dihydrogen phosphate

H₂PO₄

hydrogen phosphate

HPO₄^2-

iodate

IO₃^-

manganate

MnO₄^2-

nitrate

NO₃^-

oxalate

C₂O₄^2-

phosphate

PO₄^3-

silicate

SiO₃^2-

thiocyanate

SCN^-

thiosulfate

S₂O₃^2-