| Reactions of Thorium |
Reactions with air |
| When it is exposed to oxygen, thorium slowly tarnishes in air, becoming grey and eventually black. |
| Reduction Potentials | |
| Balanced half-reaction | E0 / V |
Th4+ + 4e- Th(s) |
-1.90 |
Th(OH)4(s) + 4e- Th(s) + 4OH- |
-2.48 |