| Name | promethium |
|---|---|
| Symbol | Pm |
| Atomic Weight | 145 |
| Atomic Number | 61 |
| CAS ID | 7440-12-2 |
| Group Number | |
| Group Name | Lanthanoid |
| Period Number | 6 |
| Origin of Name | Greek, Prometheus, who stole fire from the gods. |
| Year Discovered | 1945 |
| Discovery Credits | Produced by J. A. Marinsky, L. E. Glendenin, and C. D. Coryell at Oak Ridge, Tennessee, USA. |
| Class | Metallic |
| Color | Metallic |
| Standard State | Solid at 77 F & 298 K |
| Description | Radioactive metal of the lanthanide group. Used in specialized miniature batteries and radioactive tracers. |