| Element | Actinium |
| Symbol | Ac |
| Atomic Number | 89 |
| Molar Mass | 227.03 g mol-1 |
| Electron Configuration | [Rn]6d17s2 |
| Normal State | solid metal |
| Density @STP | 10.07 g cm-3 |
| Melting Point | 1051oC |
| Boiling Point | 3200oC |
| Stable Isotopes | 169Tm |
| Atomic Radius | 188 pm |
| Ionic Radius | 118 (4+) pm |
| Electronegativity (Pauling) | 1.1 |
| Ionization Energy (1st) | 499 kJ mol-1 |
| Ionization Energy (2nd) | 1170 kJ mol-1 |
| Ionization Energy (3rd) | 1900 kJ mol-1 |
| Molar Heat Capacity | 27.2 J K-1mol-1 |
| Standard Molar Entropy | 56.5 J K-1mol-1 |
| Enthalpy of Fusion | 14.2 kJ mol-1 |
| Enthalpy of Vapourization | 418 kJ mol-1 |
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