Polytomic Ions

Ammonium

NH4+

Silicate

SiO4 -4

Phosphite

PO3 -3

Phosphate

PO4 -3

Arsenate

AsO4 -3

Carbonate

CO3 -2

Sulfite

SO3 -2

Sulfate

SO4 -2

Thiosulfate

S2O3 -2

Chromate

CrO4 -2

Dichromate

Cr2O7 -2

Oxalate

C2O4 -2

Peroxide

O2 -2

Hydroxide

OH-1

Hydrogen Carbonate (Bicarbonate)

HCO3 -1

Nitrite

NO2 -1

Nitrate

NO3 -1

Acetate

C2H3O2 -1

Hypochlorite

ClO -1

Chlorite

ClO2 -1

Chlorate

ClO3 -1

Perchlorate

ClO4 -1

Cyanide

CN -1

Thiocyanate

SCN -1

Permanganate

MnO4 -1

Hydrogen Sulfate

HSO4 -1

Bromate

BrO3 -1

Iodate

IO3 -1

Periodate

IO4 -1