Characteristics of the element
| Symbol: Ac |
| Name: Actinium |
| Latin name: Actinium |
| Atomic number: 89 |
| Atomic mass: 227 |
| Melting point: 1050 (°C) |
| Boiling point: 3300 (°C) |
| Density 9,84 (g/cm 3 ) |
| Electronegativity: 1 |
| Oxidation number: III |
| Number of neutrons: 138 |
| Crystal structure: Cubic |
| Chemical serie: Rare earth elements |
| Color: silver |
| Electron configuration: 2-8-18-32-18-9-2 |
| Year of discovery:: 1899 |
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Update: 26.11.25
Update: 26.11.25