The element quietly sitting in millions of smoke detectors worldwide.
- Atomic number
- 95
- Atomic mass
- [243] u
- Phase
- Solid
- Electron configuration
- [Rn] 5f⁷ 7s²
- Melting point
- 1,449 K · 1,175.9 °C
- Boiling point
- 2,284 K · 2,010.9 °C
- Density
- 12 g/cm³
- Electronegativity
- 1.13
- Period / Group
- 7 / —
- Discovery year
- 1944