Biochemistry

Polyatomic Ions

A list, in alphabetical order, of the most common polyatomic ions, polyatomic anions, polyatomic cations, most common polyatomic ions, table of polyatomic ions, polyatomic anion list.

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(Alphabetical by Name)

Acetate                                    C2H3O2 1- or CH3COO 1-

Aluminate                              AlO3 3-

Amide                                     NH2 1-

*Ammonium*                        NH4 1+

Arsenate                                 AsO4 3-

Azide                                       N3 1-

Benzoate                                C6H5COO 1-

Borate                                     BO3 3-

Bromate                                  BrO3 1-

Bromite                                   BrO2 1-

Carbide (saltlike)                     C2 2-

Carbonate                                CO3 2-

Chlorate                                  ClO3  1-

Chlorite                                   ClO­2 1-

Chromate                                CrO4 2-

Citrate                                     C6H5O7 3-

Cyanate                                   OCN 1-

Cyanide                                   CN 1-

Dichromate                             Cr2O7 2-

Dihydrogen Phosphate           H2PO4 1-

Diphosphate (Pyrophospate)   P2O7 4-

Ferricyanide                            Fe(CN)6 3-

Ferrocyanide                           Fe(CN)6 4-

Formate                                   HCOO 1-

Hydride                                   H 1-

*Hydrogen*                            H 1+

Hydrogen Carbonate   HCO3 1-

(Bicarbonate)

Hydrogen Oxalate                   HC2O4 1-

(Binoxalate)

Hydrogen Phosphate              HPO4 2-

(Monohydrogen Phospate)

Hydrogen Sulfate                    HSO4 1-

(Bisulfate)

Hydrogen Sulfite                     HSO3 1-

(Bisulfite)

Hydrogen Sufide                     HS 1-

(Bisulfide or Hydrosulfide)

*Hydronium*                         H3O 1+

Hydroxide                               OH 1-

Hypobromite                          BrO 1-

Hypochlorite                          ClO 1-

Hypoiodite                             IO 1-

Hypophosphite                      PO2 3-

Imide                                       NH 2-

Iodate                                      IO3 1-

Iodite                                       IO2 1-

Manganate                              MnO4 2-

Metasilicate (chain)                (SiO3 2-)x

Nitrate                                     NO3 1-

Nitrite                                     NO2 1-

Oxalate                                    C2O4 2-

Perbromate                              BrO4 1-

Perchlorate                              ClO4 1-

Periodate                                 IO4 1-

Permanganate                          MnO4 1-

Peroxide                                  O­2 2-

Peroxydisulfate                       S2O8 2-

Phosphate                               PO4 3-

Phosphite                                PO­3 3-

Phthalate                                 C8H4O4 2-

Polysulfide                              Sx 2-

Selenate                                   SeO4 2-

Silicate                                     SiO4 4-

Sulfate                                     SO4 2-

Sulfite                                      SO3 2-

Tartrate                                   C4H4O6 2-

Tellurate                                  TeO4 2-

Tellurite                                  TeO3 2-

Tetraborate                             B4O7 2-

Thiocyanate                            SCN 1-

Thiosulfate                              S2O3 2-

Triiodide                                 I3 1-

Tripolyphospate                    P3O10 5-

Tungstate                                WO4 2-

Vandate                                   VO3 1-

Zincate                                     ZnO2 2-