Common Polyatomic Ions (Table 10.1)

OH(-)

hydroxide

CN(-)

cyanide

SCN(-)

thiocyanate

HCO3(-)

Hydrogen carbonate (bicarbonate)

HSO3(-)

Hydrogen sulfite (bisulfite)

HSO4(-)

Hydrogen sulfate (bisulfate)

C2H3O2(-)

acetate (Also written as CH3COO(-))

NO2(-)

nitrite

NO3(-)

nitrate

MnO4(-)

permangenate

ClO(-)

hypochlorite

ClO2(-)

chlorite

ClO3(-)

chlorate

ClO4(-)

perchlorate

O2(2-)

peroxide

CO3(2-)

carbonate

SO3(2-)

sulfite

SO4(2-)

sulfate

S2O3(2-)

thiosulfate

C2O4(2-)

oxalate

CrO4(2-)

chromate

Cr2O7(2-)

dichromate

PO3(3-)

phosphite

PO4(3-)

phosphate

NH4(+)

ammonium

Hg2(2+)

mercury (I)