HUGE List of Ions

includes very obscure ones, more than you'll ever need

Hypochlorite

ClO^-

Chlorite

ClO2^-

Chlorate

ClO3^-

Perchlorate

ClO4^-

Hypobromite

BrO^-

Bromite

BrO2^-

Bromate

BrO3^-

Perbromate

BrO4^-

Hypoiodite

IO^-

Iodite

IO2^-

Iodate

IO3^-

Periodate

IO4^- (metaperiodate; orthoperiodate IO6^5- also exists)

Triiodide

I3^-

Azide

N3^-

Nitroxide

NO^-

Nitrite

NO2^-

Nitrate

NO3^-

Peroxynitrate

NO4^- (don't confuse with peroxynitrite, ONOO^-, an isomer of nitrate)

Hyponitrite

N2O2^2-

Sulfoxylate

SO2^2-

Sulfite

SO3^2-

Sulfate

SO4^2-

Peroxymonosulfate / Persulfate

SO5^2- (caution: "persulfate" alone usually means peroxydisulfate S2O8^2-)

Thiosulfate

S2O3^2- (sulfate with one O replaced by S)

Bisulfide / Hydrosulfide

HS^-

Hydrogen sulfoxylate

HSO2^-

Bisulfite / Hydrogen sulfite

HSO3^-

Bisulfate / Hydrogen sulfate

HSO4^-

Hydrogen peroxymonosulfate / Hydrogen persulfate

HSO5^-

Disulfide

S2^2-

Dithionite

S2O4^2-

Pyrosulfite / Disulfite

S2O5^2-

Dithionate

S2O6^2-

Pyrosulfate / Disulfate

S2O7^2-

Peroxydisulfate

S2O8^2- (often just called "persulfate")

Phosphate / Orthophosphate

PO4^3-

Peroxymonophosphate

PO5^3-

Phosphonate / Hydrogen Phosphite

HPO3^2- (many gen-chem tables write phosphite as PO3^3-; the real ion has the H directly on P)

Hydrogen phosphate

HPO4^2-

Hydrogen peroxymonophosphate

HPO5^2-

Phosphanide

H2P^-

Phosphinate / Hypophosphite

H2PO2^-

Hydrogen phosphite

H2PO3^-

Dihydrogen phosphate

H2PO4^-

Dihydrogen peroxymonophosphate

H2PO5^-

Polyphosphides

P4^2-, P7^3-, P11^3-

Diphosphite / Pyrophosphite

H2P2O5^2-

Diphosphate / Pyrophosphate

P2O7^4-

Peroxydiphosphate

P2O8^4-

Carbonate

CO3^2-

Bicarbonate / Hydrogen carbonate

HCO3^-

Acetylide

C2^2-

Cyanide

CN^-

Cyanate

OCN^- (fulminate, CNO^-, is a distinct isomer)

Thiocyanate

SCN^-

Ferricyanide / Hexacyanoferrate(III)

Fe(CN)6^3-

Ferrocyanide / Hexacyanoferrate(II)

Fe(CN)6^4-

Methoxide / Methanolate

CH3O^-

Ethoxide / Ethanolate

C2H5O^-

Phenolate / Phenoxide

C6H5O^-

tert-Butoxide

(CH3)3CO^-

Formate / Methanoate

HCOO^- (also written HCO2^-)

Acetate / Ethanoate

CH3COO^- (also written C2H3O2^-)

Benzoate

C6H5COO^-

Oxalate

C2O4^2-

Citrate

C6H5O7^3-

Tartrate

C4H4O6^2-

Manganate

MnO4^2-

Permanganate

MnO4^-

Chromate

CrO4^2-

Dichromate

Cr2O7^2-

Molybdate

MoO4^2-

Tungstate / Orthotungstate

WO4^2-

Hydroxide

OH^-

Peroxide

O2^2-

Superoxide

O2^-

Ozonide

O3^-

Azanide / Amide

NH2^-

Orthosilicate

SiO4^4-

Metasilicate

SiO3^2- (the "SiO3^2-" often just called silicate in intro courses)

Borate / Orthoborate

BO3^3-

Tetraborate

B4O7^2- (the borax anion)

Arsenite

AsO3^3-

Arsenate

AsO4^3-

Borohydride / Tetrahydroborate

BH4^-

Ammonium

NH4^+

Phosphonium

PH4^+

Hydronium / Oxonium

H3O^+

Fluoronium

H2F^+

Sulfonium

H3S^+

Guanidinium

C(NH2)3^+

Tropylium

C7H7^+

Triphenylcarbenium / Trityl cation

(C6H5)3C^+

Cyclopropenium

C3H3^+

Trifluoromethyl cation

CF3^+

Pyrylium

C5H5O^+

Mercury(I) / Mercurous

Hg2^2+

Dihydrogen cation

H2^+

Ammonium

NH4^+

Methylammonium

CH3NH3^+