25 Common Polyatomic Ions

Cyanide

C N -

Carbonate

C O3 2-

Acetate

C2 H3 O2 -

Oxalate

C2 O4 2-

Chromate

Cr O4 2-

Dichromate

Cr2 O7 2-

Permanganate

Mn O4 -

Ammonium

N H4 +

Nitrite

N O2 -

Nitrate

N O3 -

Hydroxide

O H -

Phosphite

P O3 3-

Phosphate

P O4 3-

Sulfite

S O3 2-

Sulfate

S O4 2-

Silicate

Si O3 2-

Hypochlorite

Cl O -

Chlorite

Cl O2 -

Chlorate

Cl O3 -

Perchlorate

Cl O4 -

Hydrogen Carbonate

H C O3 -

Hydrogen Phosphate

H P O4 2-

Hydrogen Sulfite

H S O3 -

Dihydrogen Phosphate

H2 P O4 -