The second-to-last gap in the seventh period, filled in 2010 with a berkelium target.
- Atomic number
- 117
- Atomic mass
- [294] u
- Phase
- Solid
- Electron configuration
- [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁵
- Melting point
- 623 K · 349.9 °C
- Boiling point
- 883 K · 609.9 °C
- Density
- 7.2 g/cm³
- Electronegativity
- —
- Period / Group
- 7 / 17
- Discovery year
- 2010