The rarest naturally occurring element on Earth — perhaps 25 grams exist in the entire crust at any moment.
- Atomic number
- 85
- Atomic mass
- 210 u
- Phase
- Solid
- Electron configuration
- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵
- Melting point
- 575 K · 301.9 °C
- Boiling point
- 610 K · 336.9 °C
- Density
- 7 g/cm³
- Electronegativity
- 2.2
- Period / Group
- 6 / 17
- Discovery year
- 1940