100
257.00
Fm
Fermium
Identification
CAS Number: 7440-72-4
Discovery Year: 1953
Discoverer: Argonne, Los Alamos, U of Calif
Discovery Location: United States
Properties
Atomic Dimensions
Van der Waals Radius: 245.00000000000003 pm
Thermodynamics
Electronic Structure
Abundance & Geochemistry
Goldschmidt Class: synthetic
About
Radioactive metallic transuranic element, belongs to the actinoids. Ten known isotopes, most stable is Fm-257 with a half-life of 10 days. First identified by Albert Ghiorso and associates in the debris of the first hydrogen-bomb explosion in 1952.
Isotopes
Fm-253 253 ☢ 3.00 d
Fm-257 257 ☢ 101 d
