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Pm
Promethium
#61 · Lanthanide
| I-Mass | 145.0 u |
| Uxinano | 7.26 g/cm³ |
| Uthuthu | 1315.0 K |
| Ukomisa | 3273.0 K |
| Electronegativity | 1.13 |
| Ionization energy | 540.0 kJ/mol |
| Atomic radius: | 183.0 pm |
| I-Block | f- iblock |
| Ilizwe (RT) | I-Solid |
| Qwalasela | [Xe] 4f5 6s2 |