Poly atomic

Acetate

C2H3O2(1-)

ClO3(1-)

Chlorate

Cyanide

CN (-1)

Hydroxide

OH(1-)

Nitrate

NO3(1-)

Permanganate

MnO4(1-)

Carbonate

CO3(2-)

Chromate

CrO4(2-)

Dichromate

Cr2O7(2-)

Oxalate

C2O4(2-)

Peroxide

O2(2-)

Sulfate

SO4(-2)

Borate

BO3(3-)

Phosphate

PO4(3-)

Ammonium

NH4(+1)

H3O(+1)

Hydronium