| Attribute | Value |
|---|---|
| Symbol | Ac |
| Standard state | Solid |
| Atomic mass | 227.02775 u |
| Electron configuration | [Rn]7s²6d¹ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 1.1 |
| Atomic radius (van der waals) | 260 pm |
| Ionization energy | 5.17 eV |
| Melting point | 1324 K |
| Boiling point | 3471 K |
| Density | 10.07 g/cm³ |
| Atomic number | 89 |
| Group name | Actinide |
| Discovered | 1899 year |
| Electron affinity | Add |