Symbols and charges for polyatomic ions

nitrate

NO₃^-

nitrite

NO₂^-

chromate

CrO₄^2-

dichromate

Cr₂O₇^2-

cyanide

CN^-

permangranate

MnO₄^-

hydroxide

OH^-

carbonate

CO₃^2-

sulfate

SO₄^2-

sulfite

SO₃^2-

oxalate

C₂O₄^2-

phosphate

PO₄^3-

phosphite

PO₃^3-

perchlorate

ClO₄^-

chlorate

ClO₃^-

chlorite

ClO₂^-

hypochlorite

ClO^-

iodate

IO₃^-

bromate

BrO₃

arsenate

AsO₄^3-

silicate

SiO₃^2-

borate

BO₃^3-

thiocyanate

SCN^-

ammonium

C₂H₃O₂^-

ammonium ion

NH₄⁺