Promethium

Promethium (Pm)

Atomic Number: 61
Atomic Weight: not known
Melting Point: 1080
Boiling Point: 2460
Specific Gravity: not known
Valence(s): 3

Promethium was predicted by Branner in 1902, and was officially produced in the laboratory in 1945. It is radioactive, emitting beta particles. It is believed that Promethium is not in the crust of the Earth. Promethium may be used as a nuclear-powered battery that captures and converts light in photocells. [LM] {RW}