Promethium is a chemical element from the periodic table. It is a rare earth metal that is silvery-white in color. Promethium is used in various industrial applications, such as the production of nuclear batteries and in the manufacture of certain types of lasers. It is also used in some scientific research and medical applications.
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| Atomic number | 61 |
| Group | VIIB |
| Period | 6 |
| Mass | 145 |
| Latin name | Promethium |
| Electron configuration | [Xe]4f5 6s2 |
| Oxidation state | 0, 2, 3 |