Polyatomic ions

ammonium

NH₄⁺

nitrite

NO₂⁻

nitrate

NO₃⁻

sulfite

SO₃²⁻

sulfate

SO₄²⁻

hydrogen sulfate
(aka: bisulfate)

HSO₄⁻

thiosulfate

S₂O₃²⁻

oxalate

C₂O₄²⁻

hydroxide

OH⁻

phosphite

PO₃³⁻

phosphate

PO₄³⁻

hydrogen phosphate

HPO₄²⁻

dihydrogen phosphate

H₂PO₄⁻

perchlorate

ClO₄⁻

chlorate

ClO₃⁻

chlorite

ClO₂⁻

hypochlorite

ClO⁻

bromate

BrO₃⁻

iodate

IO₃⁻

acetate
acetate

CH₃COO⁻
C₂H₃O₂⁻

carbonate

CO₃²⁻

hydrogen carbonate
(aka: bicarbonate)

HCO₃⁻

chromate

CrO₄²⁻

dichromate

Cr₂O₇²⁻

permanganate

MnO₄⁻

peroxide

O₂²⁻

cyanide

CN⁻

cyanate

OCN⁻

thiocyanate

SCN⁻