Actinium
Actinide| Atomic number | 89 |
|---|---|
| Category | Actinide |
| Atomic mass | 227 |
| Electron configuration | [Rn]6d¹ 7s² |
| Oxidation states | +3 |
| Electronegativity | 1.1 |
| Melting point | 1,050 °C |
| Boiling point | 3,200 °C |
| Density | 10.07 g/cm³ |
| Crystal structure | Face-centred cubic |
| Period | 7 |
| Block | f |
| Discovered | 1,899 |
| Crustal abundance | 0 ppm |