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Pa
Protactinium
#91 · Actinide
| Mass | 231.03588 u |
| Density | 15.37 g/cm³ |
| Melting | 1841.0 K |
| Boiling | 4300.0 K |
| Electronegativity | 1.5 |
| Ionization Energy | 568.0 kJ/mol |
| Atomic Radius | 163.0 pm |
| Block | f-block |
| State (RT) | Solid |
| Config | [Rn] 5f2 6d1 7s2 |