Common Polyatomic Ions

Carbonate

Carbonate

CO3 2-

Bicarbonate

HCO3 1-

Acetate

CH3COO 1-

Cyanide

CN 1-

Thiocyanate

SCN 1-

Hypochlorite

ClO 1-

Chlorite

ClO2 1-

Chlorate

ClO3 1-

Perchlorate

ClO4 1-

Chromate

CrO4 2-

Dichromate

Cr2O7 2-

Permanganate

MnO4 1-

Azide

N3 1-

Ammonium

NH4 1+

Nitrite

NO2 1-

Nitrate

NO3 1-

Hydroxide

OH 1-

Peroxide

O2 2-

Phosphate

PO4 3-

Hydrogen phosphate

HPO4 2-

Dihydrogen phosphate

H2PO 4-

Disulfide

S2 2-

Sulfite

SO3 2-

Sulfate

SO4 2-

Hydrogen Sulfite

HSO3 1-

Hydrogen Sulfate

HSO4 1-

mono-

one

di-

two

tri-

three

tetra-

four

penta-

five

hexa-

six

hepta-

seven

octa-

eight

nona-

nine

deca-

ten

Cyanate

HCN 1-