The first transuranic element, made by bombarding uranium with neutrons in 1940.
- Atomic number
- 93
- Atomic mass
- 237 u
- Phase
- Solid
- Electron configuration
- [Rn] 5f⁴ 6d¹ 7s²
- Melting point
- 917 K · 643.9 °C
- Boiling point
- 4,300 K · 4,026.9 °C
- Density
- 20.45 g/cm³
- Electronegativity
- 1.36
- Period / Group
- 7 / —
- Discovery year
- 1940