Examples of Common Polyatomic Ions
The following tables give examples of commonly encountered polyatomic ions. Only a few representatives are given, as the number of polyatomic ions encountered in practice is very large.
Anions | |
---|---|
Acetate (ethanoate) | CH3COO− or C2H3O− 2 |
Acetylide | C2− 2 |
Benzoate | C6H5COO− or C7H5O− 2 |
Bicarbonate (hydrogen carbonate) | HCO− 3 |
Carbonate | CO2− 3 |
Cyanide | CN− |
Hydroxide | OH− |
Nitrate | NO− 3 |
Phosphate | PO3− 4 |
Sulfate | SO2− 4 |
Cations | |
---|---|
Ammonium | NH+ 4 |
Phosphonium | PH+ 4 |
Hydronium | H3O+ |
Fluoronium | H2F+ |
Mercury(I) | Hg2+ 2 |
Tropylium | C7H+ 7 |
Guanidinium | C(NH2)+ 3 |
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