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Ac
Actinium
#89 · Actinide
| I-Mass | 227.02775 u |
| Uxinano | 10.07 g/cm³ |
| Uthuthu | 1323.0 K |
| Ukomisa | 3471.0 K |
| Electronegativity | 1.1 |
| Ionization energy | 499.0 kJ/mol |
| Atomic radius: | 195.0 pm |
| I-Block | f- iblock |
| Ilizwe (RT) | I-Solid |
| Qwalasela | [Rn] 6d1 7s2 |