Chemistry

Polyatomic Ions

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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-



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