Polyatomic Ions

Acetate

CH3COO− or C2H3O2−

Polyatomic ions HCO2− Formate (formiate)

Pertechnetate

TcO4−

Aluminate

AlO2−, Al2O42−

Fulminate

Phosphate

PO43−

Amide

NH2−

Hydrazide

CNO− N2H3−

Phosphite

PO33−

Ammonium

NH4+

Hydrogen carbonate

HCO3−

Plumbate

PbO32−

Antimonate

SbO43−

Hydrogen arsenate

HAsO42−

Plumbite

PbO22−

Antimonite

SbO33−

Hydrogen phosphate

HPO42−

Pyridinium

C5H6N+

Arsenate

AsO43−

Hydrogen phosphite

HPO32−

Pyrophosphate

P2O74−

Arsenite

AsO33−

Hydrogen sulfate

HSO4−

Pyrylium

C5H5O+

Azide

N3−

Hydrogen sulfite

HSO3−

Benzoate

C6H5COO−

Hydrogen telluride

Bicarbonate

HCO3−

Hydronium

HTe− H3O+

+ Quaternary ammonium NR4 SeO42− Selenate

Borate

BO33−

Hydroxide

Metaborate

BO2−

Tetraborate

Selenite (ion)

SeO32−

OH−

Silicate

SiO32−

Hypobromite

BrO−

Disilicate

Si2O52−

B4O72−

Hypochlorite

ClO−

Metasilicate

SiO32−

Bromate

BrO3−

Hypoiodite

Orthosilicate

SiO44−

Bromite

BrO2−

Hypophosphite

IO− PO23−

Pyrosilicate

Si2O76−

Carbide

C22−

Hyposulfite

SO22−

Stannate

SnO32−

Carbonate

CO32−

Periodate

IO4−

Stannite

SnO22−

Chlorate

ClO3−

Iodate

IO3−

Sulfate

SO42−

Chlorite

ClO2−

Iodite

IO2−

Sulfite

SO32−

Chromate

CrO42−

Isocyanate

Sulfonium

R3S+

Chromite

CrO2−

Mercury(I)

NCO− Hg22+

Superoxide

O2−

Chromyl

CrO22+

Manganate

MnO42−

Tartrate

(CH(OH)COO)22−

Citrate

C6H5O73−

Molybdate

MoO42−

Metatellurate

TeO42−

Cyanate

OCN−

Nitrate

NO3−

Orthotellurate

TeO66−

Cyanide

Nitrite

NO2−

Tellurite

TeO32−

Dichromate

CN− Cr2O72−

Oxalate

C2O42−

Thiocyanate

Dihydrogen arsenate

H2AsO4−

Ozonide

O3−

Thiosulfate

SCN− S2O32−

Perbromate

BrO4−

Tosylate

CH3C6H4SO3−

Perchlorate

ClO4−

Triflate

CF3SO3−

− Dihydrogen phosphate H2PO4 − Dihydrogen phosphite H2PO3

Dioxygenyl

O2+

Permanganate

MnO4−

Tungstate

WO 42−

Disulfide

S22−

Peroxide

O22−

Uranyl

Ferrate

FeO

Perrhenate

ReO

UO2+ VO3−

Ferricyanide

Fe(CN)

3− 6

Peroxymonosulfate

SO

Ferrocyanide

Fe(CN)

4− 6

Peroxydisulfate

S2O

2− 4

− 4

2− 5 2− 8

Vanadate Vanadyl Pervanadyl

VO2+ VO2+