Table 1.
Some biologically important oxidation states of elements.
| Symbol | Atomic number | Name | Oxidation states |
|---|---|---|---|
| V | 23 | Vanadium | IV/V |
| Cr | 24 | Chromium | III/VI |
| Mn | 25 | Manganese | II/III/IV |
| Fe | 26 | Iron | 0/II/III |
| Co | 27 | Cobalt | II/III |
| Ni | 28 | Nickel | II/IV |
| Cu | 29 | Copper | 0/I/II |
| Zn | 30 | Zinc | 0/II |
| As | 33 | Arsenic | III/V |
| Se | 34 | Selenium | II/IV/VI |
| Mo | 42 | Molybdenum | II/III/IV/VI |
| Pd | 46 | Palladium | II/IV |
| Ag | 47 | Silver | 0/I/II |
| Sn | 50 | Tin | II/IV |
| Sb | 51 | Antimony | III/V |
| Te | 52 | Tellurium | 0/II/IV/VI |
| Pt | 78 | Platinum | II/IV |
| Au | 79 | Gold | 0/I/III |
| Hg | 80 | Mercury | 0/I/II |
| Tl | 81 | Thallium | I/III |
| Pb | 82 | Lead | II/IV |
| U | 92 | Uranium | III/VI |
| Pu | 94 | Plutonium | III/IV/V/VI |