fermium

Name fermium
Symbol Fm
Atomic Weight 257.10
Atomic Number 100
CAS ID 7440-72-4
Group Number (none)
Group Name Actinoid
Period Number 7
Origin of Name Named after Enrico Fermi.
Year Discovered 1942
Discovery Credits Discovered in the debris of the 1952 thermonuclear explosion in the Pacific by G. R. Choppin, S. G. Thompson, A. Ghlorso, and B. G. Harvey.
Class Metallic
Color Unknown, but probably metallic and silvery white or gray in appearance.
Standard State Solid at 77 F & 298 K
Description Radioactive metal which does not occur naturally, and is of research interest only.

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