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Promethium | Send-To | Print | More
[syn: Pm]
Category: Chemistry | 1319 views
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© Jay F. Kominek
Symbol: Pm
Atomic number: 61
Atomic weight: (147)
Soft silvery metallic element, belongs to the lanthanoids. Pm-147, the only natural isotope, is radioactive and has a half-life of 252 years.
Eighteen radioisotopes have been produced, but all have very short
half-lives. Found only in nuclear decay waste. Pm-147 is of interest as a beta-decay source, however Pm-146 and Pm-148 have to be removed from it first, as they generate gamma radiation. Discovered by J.A. Marinsky, L.E. Glendenin and C.D. Coryell in 1947.
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