Name: Fermium
Symbol: Fm
Atomic Number: 100
AtomicWeight: 257.000000
Family: Actinides
CAS RN: 7440-72-4
Description: A radioactive metal
State (25 °C): Solid
Melting Point: 1125 °K
Boiling Point: – °K
Density: – g/cm³
Oxidation states: +3
Electron Configuration: [Rn] 5f¹²7s²
Radius: no data pm (Covalent)
Electronegativity: 1.3 (Pauling Scale)

1st Ionization Energy: 627 KJ/mole
2nd Ionization Energy: 1225 KJ/mole
3rd Ionization Energy: 2363 KJ/mole