Fermium: the essentials
Fermium's chemical properties are largely unknown. Fermium is a radioactive rare earth metal. The longest living isotope is is 257Fm with a half-life of 80 days. It is of no commercial importance.
Fermium: historical information
Fermium was identified by Ghiorso and coworkers (Berkeley, California, USA) in 1952 in the radioactive debris from a thermonuclear explosion in the Pacific. Somewhat remarkably, the fermium isotope discovered was made through the combination of 238U with 17 neutrons. Today, many isotopes are known spanning the mass range 243-258.
Fermium around us Read more »
Fermium has no biological role.
Fermium is a synthetic element that is not present in the geosphere.
|Location||ppb by weight||ppb by atoms||Links|
|Universe||(no data)||(no data)|
|Crustal rocks||(no data)||(no data)|
|Human||(no data) ppb by weight||(no data) atoms relative to C = 1000000|
Physical properties Read more »
Heat properties Read more »
- Melting point: about 1800 [1527 °C (2781 °F)] K
- Boiling point: (no data) K
- Enthalpy of fusion: |203| kJ mol-1
Crystal structure Read more »
The solid state structure of fermium is: .
Fermium: orbital properties Read more »
Fermium atoms have 100 electrons and the shell structure is 220.127.116.11.30.8.2. The ground state electronic configuration of neutral Fermium is [Rn].5f12.7s2 and the term symbol of Fermium is 3H6.
- Pauling electronegativity: 1.3 (Pauling units)
- First ionisation energy: 627 kJ mol‑1
- Second ionisation energy: (no data) kJ mol‑1
Isolation: coming soon!
Fermium isotopes Read more »