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| name |
Promethium |
| latin |
Promethium |
| french |
Prométhium |
| german |
Promethium |
| symbol |
Pm |
| proton number |
61 |
| atomic weight |
[145] |
| Pauling electronegativity |
- |
| electronic configuration |
[Xe] 4f55d06s2
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| melting point |
1373 K, 1100°C, 2012°F |
| boiling point |
3273 K, 3000°C, 5432°F |
| group |
- |
| period |
6 |
| state (by 20°C) |
solid |
| oxidation states |
+3 |
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Discoverer
| Year of discovery |
Discoverers |
| 1945 |
Jacob A. Marinsky
Lawrence E. Glendenin
Charles D. Coryell |
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Czech version