Periodic Table of the Elements: Promethium
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| Atomic Number: | 61 |
| Atomic Symbol: | Pm |
| Promethiumpromethium , artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042°C;; b.p. 3,000°C; (estimated); sp. gr. unknown; valence +3. ..... Click the link for more information. | |
| Atomic Weight: | (145) |
| Electron Configuration: | 2 · 8 · 18 23 · 8 · 2 |