100 Fm
Actinide
Fermium
Named after Fermi.
Properties of Fermium
- Atomic number (Z)
- 100
- Symbol
- Fm
- Atomic mass
- 257 g/mol
- Category
- Actinide
- Group
- 3
- Period
- 7
- Electron configuration
- [Rn] 5f¹² 7s²
- Electronegativity (Pauling)
- 1.3
- Atomic radius
- —
- First ionization energy
- 627 kJ/mol
- Melting point
- 1800 K (1526.8 °C)
- Boiling point
- —
- Density
- —
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1952