Name californium
Symbol Cf
Atomic Weight 251.08
Atomic Number 98
CAS ID 7440-71-3
Group Number (none)
Group Name Actinoid
Period Number 7
Origin of Name After the state, California, USA
Year Discovered 1950
Discovery Credits Produced by S. G. Thompson, K. Street Jr., A. Ghiorso, and G. T. Seaborg at Berkeley, CA, USA
Class Metallic
Color Unknown, but probably metallic and silvery white or gray in appearance
Standard State Solid at 77 F & 298 K
Description Radioactive, silvery metal which does not occur naturally. Attacked by oxygen, steam, and acids, but not alkalis. Cf 252 is used in cancer therapy and is a potent source of thermal neutrons.

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