The heaviest primordial element, and the one that split the twentieth century in two.
- Atomic number
- 92
- Atomic mass
- 238.029 u
- Phase
- Solid
- Electron configuration
- [Rn] 5f³ 6d¹ 7s²
- Melting point
- 1,405.3 K · 1,132.2 °C
- Boiling point
- 4,404 K · 4,130.9 °C
- Density
- 19.1 g/cm³
- Electronegativity
- 1.38
- Period / Group
- 7 / —
- Discovery year
- 1789