AP Chemistry Common Polyatomic Ions

H2PO4 -

dihydrogen phosphate

C2H3O2 -

acetate

HSO3 -

hydrogen sulfite (bisulfite)

HSO4 -

hydrogen sulfate (bisulfate)

HCO3 -

hydrogen carbonate (bicarbonate)

NO2 -

nitrite

NO3 -

nitrate

CN -

cyanide

CNO -

cyanate

SCN -

thiocyanate

OH -

hydroxide

MnO4 -

permanganate

ClO -

hypochlorite

ClO2 -

chlorite

ClO3 -

chlorate

ClO4 -

perchlorate

BiO3 -

bismuthate

HPO4 2-

hydrogen phosphate

C2O4 2-

oxalate

SO3 2-

sulfite

SO4 2-

sulfate

CO3 2-

carbonate

S2O3 2-

thiosulfate

CrO4 2-

chromate

Cr2O7 2-

dichromate

SiO3 2-

silicate

O2 2-

peroxide

SeO4 2-

selenate

SeO3 2-

selenite

TeO4 2-

tellurate

TeO3 2-

tellurite

PO3 3-

phosphite

PO4 3-

phosphate

AsO3 3-

arsenite

AsO4 3-

arsenate

Fe(CN)6 3-

hexacyanoferrate (III)

BO3 3-

borate

NH4 +

ammonium

Fe(CN)6 4-

hexacyanoferrate (II)

BrO -

hypobromite

BrO2 -

bromite

BrO3 -

bromate

BrO4 -

perbromate

IO -

hypoiodite

IO2 -

iodite

IO3 -

iodate

IO4 -

periodate

FO -

hypofluorite

FO2 -

fluorite

FO3 -

fluorate

FO4 -

perfluorate

(O2)-

superoxide

(MoO4)2-

Molybdate

(Hg2)2+

Mercury I

H3O+

hydronium