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Ac
Actinium
#89 · Actinide
| Mass | 227.02775 u |
| Density | 10.07 g/cm³ |
| Melting | 1323.0 K |
| Boiling | 3471.0 K |
| Electronegativity | 1.1 |
| Ionization Energy | 499.0 kJ/mol |
| Atomic Radius | 195.0 pm |
| Block | f-block |
| State (RT) | Solid |
| Config | [Rn] 6d1 7s2 |