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Explore the World of Soft…e: Engineering & Science
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PROMETHI.ASC
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1992-08-23
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625b
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17 lines
PROMETHIUM
Atomic symbol - Pm
Atomic weight - (144.9127)
Atomic number - 61
Electron configuration - 2-8-18-23-8-2
Oxidation states - +3
State of matter - synthetic
Heavy metal-brittle
Discovered in 1947 by J.A. Marinsky, L.E. Glendenin, and C.D. Coryell
Boils at 2460 °C, melts at 1080 °C
Notes:
Promethium was the last of the rare-earth metals to be discovered. Its soft
beta radiation can be coverted into electricity by sandwiching promethium and
semiconductors such as silicon together; these "batteries" can last as long as
5 years in extreme temperatures.