Made in milligram quantities and used mainly as a target for creating even heavier elements.
- Atomic number
- 97
- Atomic mass
- [247] u
- Phase
- Solid
- Electron configuration
- [Rn] 5f⁹ 7s²
- Melting point
- 1,323 K · 1,049.9 °C
- Boiling point
- 2,900 K · 2,626.9 °C
- Density
- 14.78 g/cm³
- Electronegativity
- 1.3
- Period / Group
- 7 / —
- Discovery year
- 1949