Compare Element Properties
| Property | Ac Actinium | ? N/A |
|---|---|---|
| Atomic number | 89 | N/A |
| Symbol | Ac | N/A |
| Name | Actinium | N/A |
| Category | actinide | N/A |
| Standard Atomic Weight | 227 u | N/A |
| Period | 7 | N/A |
| Group | N/A | N/A |
| Block | s | N/A |
| Phase at STP | solid | N/A |
| Electron configuration | [Rn]7s26d1 | N/A |
| Oxidation states | [3] | N/A |
| Electronegativity (Pauling) | 1.1 | N/A |
| Electron affinity | 0.35 eV | N/A |
| Density | 1.007000e+4 kg/m³ | N/A |
| Melting point | 1050.85 °C | N/A |
| Boiling point | 3197.85 °C | N/A |
| Discovery year | 1899 | N/A |