| Content-Type | image/png |
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| Content-Length | 2.15 kB |
| Size | 512x512 |
#61 Promethium - rarity BROWNIAN-MANIACS
| 1st ionization energy | 5.55 eV | 0.85% |
|---|---|---|
| appearance | Metallic appearance | 0.85% |
| atomic mass | 145 u | 0.85% |
| atomic number | 61 | 0.85% |
| atomic radius | 236 picometers (van der Waals radius) | 0.85% |
| boiling point | 3273 K or 3000 °C or 5432 °F | 1.69% |
| cas number | 7440-12-2 | 0.85% |
| category | Inner transition metals | 23.73% |
| crystal structure | Double hexagonal close packed | 5.08% |
| density | 7.26 g/cm3 | 0.85% |
| electronic configuration | [Xe] 4f5 6s2 | 0.85% |
| electrons | 61 | 0.85% |
| electrons arrangement | 2, 8, 18, 23, 8, 2 | 0.85% |
| main isotopes | 145Pm and 147Pm | 0.85% |
| melting point | 1315 K or 1042 °C or 1908 °F | 0.85% |
| neutrons | 84 | 1.69% |
| position | Group: lanthanides, Period: 6, Block: f | 6.78% |
| rarity | BROWNIAN-MANIACS | 33.33% |
| state | Solid | 72.88% |
| symbol | Pm | 0.85% |
| who discovered | Lawrence Glendenin, Jacob Marinsky, Charles Coryell (in 1945) | 0.85% |
Total Rarity Score: 1813
Rarity: #79/354