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Protactinium
#91 · Actinide
| I-Mass | 231.03588 u |
| Uxinano | 15.37 g/cm³ |
| Uthuthu | 1841.0 K |
| Ukomisa | 4300.0 K |
| Electronegativity | 1.5 |
| Ionization energy | 568.0 kJ/mol |
| Atomic radius: | 163.0 pm |
| I-Block | f- iblock |
| Ilizwe (RT) | I-Solid |
| Qwalasela | [Rn] 5f2 6d1 7s2 |