The heaviest element that can be made in weighable amounts by neutron bombardment.
- Atomic number
- 100
- Atomic mass
- [257] u
- Phase
- Solid
- Electron configuration
- [Rn] 5f¹² 7s²
- Melting point
- 1,800 K · 1,526.9 °C
- Boiling point
- —
- Density
- 9.7 g/cm³
- Electronegativity
- 1.3
- Period / Group
- 7 / —
- Discovery year
- 1952