25 common polyatomic ions

ammonium

NH4 Charge +

Dihydrogen phosphate

H2PO4 Charge -

acetate

C2H3O2 or CH3COO Charge -

hydrogen sulfite

HSO3 Charge -

hydrogen sulfate

HSO4 Charge -

hydrogen carbonate or bicarbonate

HCO3 Charge -

nitrite

NO2 charge -

nitrate

NO3 Charge -

cyanide

CN Charge -

hydroxide

OH Charge -

permanganate

MnO4 Charge -

hypochlorite

CIO Charge -

chlorite

CIO2 Charge -

chlorate

CIO3 Charge -

perchlorate

CIO4 Charge -

hydrogen phosphate

HPO4 Charge 2-

oxalate

C2O4 Charge 2-

sulfite

SO3 Charge 2-

sulfate

SO4 Charge 2-

carbonate

CO3 Charge 2-

chromate

CrO4 Charge 2-

dichromate

Cr2O7 Charge 2-

silicate

SiO3 Charge 2-

phosphite

PO3 Charge 3-

phosphate

PO4 Charge 3-

mono

1

di

2

tri

3

tetra

4

penta

5

hexa

6

hepta

7

octa

8

nona

9

deca

10