Polyatomic Ions Oxidation Numbers
| Name | Symbol | Oxidation number |
|---|---|---|
| ammonium | NH4+1 | +1 |
| hydroxide | OH-1 | -1 |
| nitrite | NO2-1 | -1 |
| nitrate | NO3-1 | -1 |
| chlorate | ClO3-1 | -1 |
| perchlorate | ClO4-1 | -1 |
| chlorite | ClO2-1 | -1 |
| hypochlorite | ClO-1 | -1 |
| iodate | IO3-1 | -1 |
| bromate | BrO3-1 | -1 |
| acetate | C2H3O2-1 | -1 |
| hydrogen sulfate | HSO4-1 | -1 |
| hydrogen carbonate | HCO3-1 | -1 |
| hydrogen sulfite | HSO3-1 | -1 |
| permanganate | MnO4-1 | -1 |
| cyanide | CN-1 | -1 |
| dihydrogen phosphate | H2PO4-1 | -1 |
| sulfate | SO4-2 | -2 |
| carbonate | CO3-2 | -2 |
| chromate | CrO4-2 | -2 |
| dichromate | Cr2O7-2 | -2 |
| oxalate | C2O4-2 | -2 |
| hydrogen phosphate | HPO4-2 | -2 |
| hexafluorosilicate | SiF6-2 | -2 |
| tartrate | C4H4O6-2 | -2 |
| selenate | SeO4-2 | -2 |
| silicate | SiO3-2 | -2 |
| phosphate | PO4-3 | -3 |
| phosphite | PO3-3 | -3 |
| arsenate | AsO4-3 | -3 |