100
Fm
Fermium
Actinide period 7 f-block discovered: 1952
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 100
- Atomic mass
- 257.09511 a.m.u.
- Electron configuration
- [Rn] 5f12 7s2
- Electronegativity
- 1.3 on the Pauling scale
- Ionization energy
- 6.50 eV
- Oxidation states
- +3
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 1800 K (1 526,85 °C)