Polyatomic Ions (common)
| Cations | |
| NH4+ | Ammonium | 
| Hg22+ | Mercury(I) | 
| Anions (1-) | |
| OH− | Hydroxide | 
| HSO4− | Hydrogen sulfate | 
| CH3COO− | Acetate | 
| ClO− | Hypochlorite | 
| ClO2− | Chlorite | 
| ClO3− | Chlorate | 
| ClO4− | Perchlorate | 
| NO2− | Nitrite | 
| NO3− | Nitrate | 
| MnO4− | Permanganate | 
| H2PO4− | Dihydrogen phosphate | 
| CN− | Cyanide | 
| HCO3− | Hydrogen carbonate | 
| SCN− | Thiocyanate | 
| Anions (2-) | |
| O22− | Peroxide | 
| SO32− | Sulfite | 
| SO42− | Sulfate | 
| S2O32− | Thiosulfate | 
| Cr2O72− | Dichromate | 
| CrO42− | Chromate | 
| CO32− | Carbonate | 
| HPO42− | Monohydrogen phosphate | 
| C2O42− | Oxalate | 
| Anions (3-) | |
| PO43− | Phosphate | 
| AsO43− | Arsenate | 
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