Symbol
Fm
Atomic Number
100
Atomic Mass
257
Protons
100
Neutrons
157
Electrons
100
Type
Actinide
Isotopes
Fermium-257
Discovery Year
1952
Discovered By
Albert Ghiorso, Glenn T. Seaborg, and others
Group
3
Period
7
Boiling Point
Unknown
Melting Point
1527°C
Electron Configuration
[Rn] 7s² 5f¹⁰
Density (g/cm³)
9.7
Crystal Structure
Cubic
Magnetism
Paramagnetic
Abundance in Earth's Crust
Trace
Phase at Room Temperature
Solid