Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Actinium | |
| Electron Configuration | 2,8,18,32,18,9,2 |
| Electron Configuration | [Rn] 6d1 7s2 |
| Electronegativity | 1.1 |
| Enthalpy of Fusion | 14.2 kJ mol-1 |
| Enthalpy of Vaporisation | 293 kJ mol-1 |
| Heat Capacity | 27.2 J mol-1 K-1 |
| Thermal Conductivity | 12 W m-1 K-1 |
| Thermal Expansion | ? μm m-1 K-1 |
| Magnetic ordering | No data |
| Atomic Radii |
|
| Atomic Radius
|
188 pm |
| Bohr Radius
|
0 pm |
| Covalent Radius
|
0 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
AcO, Ac+3 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
499 |
| M+ - M2+ |
1170 |
| M2+ - M3+ |
1900 |
| M3+ - M4+ |
4700 |
| M4+ - M5+ |
6000 |
| M5+ - M6+ |
7300 |
| M6+ - M7+ |
9200 |
| M7+ - M8+ |
10500 |
| M8+ - M9+ |
11900 |
| M9+ - M10+ |
15800 |