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
Frequently asked questions
What is Fermium?
Fermium (Fm) is an actinide, element number 100 on the periodic table. Named after Fermi.
What is the atomic number and atomic mass of Fermium?
Fermium has atomic number 100 and an atomic mass of about 257 g/mol.
What is the electron configuration of Fermium?
The electron configuration of Fermium is [Rn] 5f¹² 7s².
Where is Fermium on the periodic table?
Fermium sits in group 3, period 7, and is classified as a actinide.