Name promethium
Symbol Pm
Atomic Weight 145
Atomic Number 61
CAS ID 7440-12-2
Group Number
Group Name Lanthanoid
Period Number 6
Origin of Name Greek, Prometheus, who stole fire from the gods.
Year Discovered 1945
Discovery Credits Produced by J. A. Marinsky, L. E. Glendenin, and C. D. Coryell at Oak Ridge, Tennessee, USA.
Class Metallic
Color Metallic
Standard State Solid at 77 F & 298 K
Description Radioactive metal of the lanthanide group. Used in specialized miniature batteries and radioactive tracers.

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