Polyatomic Ions

CH₃COO / C₂H₃O₂^-

acetate

NH₂^-

amide

N₃^-

azide

C₆H₅COO^-

benzoate

BrO₃^-

bromate

ClO₃^-

chlorate

ClO₂^-

chlorite

OCN^-

cyanate

CN^-

cyanide

H₂PO₄^-

dihydrogen phosphate

HCOO^-

formate

HCO₃^-

hydrogen carbonate (bicarbonate)

HSO₄^-

hydrogen sulfate (bisulfate)

HS^-

hydrogen sulfide (bisulfide or hydrosulfide)

OH^-

hydroxide (hydroxyl when aqueous)

ClO^-

hypochlorite

IO₃^-

Iodate

NO₃^-

nitrate

NO₂^-

nitrite

ClO₄^-

perchlorate

MnO₄^-

permanganate

SCN^-

thiocyanate

I₃^-

triiodide

CO₃^2-

carbonate

CrO₄^2-

chromate

Cr₂O₇^2-

dichromate

NH^2-

imide

HPO₄^2-

monohydrogen phosphate

C₂O₄^2-

oxalate

C₈H₄O₄^2-

phthalate

SO₄^2-

sulfate

SO₃^2-

sulfite

C₄H₄O₆^2-

tartrate

S₂O₃^2-

thiosulfate

AsO₄^3-

Arsenate

BO₃^3-

borate

C₆H₅O₇^3-

citrate

PO₃^3-

phosphite

PO₄^3-

phosphate

NH₄⁺

ammonium

H₃O⁺

hydronium