Polyatomic Ions

NH4+

ammonium ion

Hg2^2+

mercury(I) ion

UO2^2+

uranyl ion

VO^2+

vanadyl ion

OH-

hydroxide ion

BO3^3-

borate ion

HCO2-

formate ion

C2H3O2- or CH3COO-

acetate ion

C2O4^2-

oxalate ion

CO3^2-

carbonate ion

CN-

cyanide ion

OCN-

cyanate ion

CNO-

fulminate ion

SCN-

thiocyanate ion

HCO3-

bicarbonate ion or hydrogen carbonate ion

SiO3^2-

silicate ion

NO3-

nitrate ion

NO2-

nitrite ion

N3-

azide ion

O2-

superoxide ion

O2^2-

peroxide ion

PO4^3-

phosphate ion

HPO4^2-

hydrogen phosphate ion

H2PO4-

dihydrogen phosphate ion

HPO3^2-

hydrogen phosphite ion

H2PO3-

dihydrogen phosphite ion

PO2^3-

hypophosphite ion

AsO4^3-

arsenate ion

SbO4^3-

antimonate ion

SO4^2-

sulfate ion

HSO4-

hydrogen sulfate ion or bisulfate ion

SO3^2-

sulfite ion

HSO3-

hydrogen sulfite ion or bisulfite ion

S2O3^2-

thiosulfate ion

SeO4^2-

selenate ion

FO4-

perfluorate ion

FO3-

fluorate ion

FO2-

fluorite ion

FO-

hypofluorite ion

ClO4-

perchlorate ion

ClO3-

chlorate ion

ClO2-

chlorite ion

ClO-

hypochlorite ion

BrO4-

perbromate ion

BrO3-

bromate ion

BrO2-

bromite ion

BrO-

hypobromite ion

IO4-

periodate ion

IO3-

iodate ion

IO2-

iodite ion

IO-

hypoiodite ion

I3-

triiodide ion

VO3-

vanadate ion

CrO4^2-

chromate ion

Cr2O7^2-

dichromate ion

FeO4^2-

ferrate ion

MnO4-

permanganate ion

SnO3^2-

stannate ion

PbO3^2-

plumbate ion