Polyatomic Cations
| Hg22+ | mercury(I) | NH4+ | ammonium |
Polyatomic Anions
| 1- | 2- | 3- | |||
| -ate, -ite | |||||
| NO3- | nitrate | SO42- | sulfate | PO43- | phosphate |
| NO2- | nitrite | SO32- | sulfite | PO33- | phosphite |
| ClO- | hypochlorite | ||||
| ClO2- | chlorite | ||||
| ClO3- | chlorate | ||||
| ClO4- | perchlorate | ||||
| (also F, Br, I) | |||||
| no -ite | |||||
| C2H3O2- | acetate | CO32- | carbonate | ||
| Metal containing | |||||
| MnO4- | permanganate | CrO42- | chromate | ||
| Cr2O72- | dichromate | ||||
| -ide | |||||
| N3- | azide | ||||
| OH- | hydroxide | ||||
| CN- | cyanide | O22- | peroxide |