all polyatomics

acetate

C₂H₃O₂^-

hydroxide

OH^-

permanganate

MnO₄^-

cyanide

CN^-

thiocyanate

SCN^-

bromate

BrO₃^-

iodate

IO₃^-

oxalate

C₂O₄^2-

chromate

CrO₄^2-

dichromate

Cr₂O₇^2-

silicate

SiO₃^2-

thiosulfate

S₂O₃^2-

peroxide

O₂^2-

borate

BO₃^3-

arsenate

AsO₄^3-

silver

Ag⁺

cadmium

Cd²⁺

nickel

Ni²⁺

zinc

Zn²⁺

bismuth

Bi³⁺

ClO^-

hypochlorite

ClO₂^-

chlorite

ClO₃^-

chlorate

ClO₄^-

perchlorate

PO₃^3-

phosphite

HPO₃^2-

hydrogen phosphite

H₂PO₃^-

dihydrogen phosphite

PO₄^3-

phosphate

HPO₄^2-

hydrogen phosphate

H₂PO₄^-

dihydrogen phosphate

SO₃^2-

sulfite

SO₄^2-

sulfate

HSO₃^-

hydrogen sulfite (bisulfite)

HSO₄^-

hydrogen sulfate (bisulfate)

CO₃^2-

carbonate

HCO₃^-

hydrogen carbonate (bicarbonate)

NO₂^-

nitrite

NO₃^-

nitrate

NH₄⁺

ammonium

Hg₂²⁺

mercury (I)

Hg²⁺

mercury (II)