Meaning Of The Word Promethium
What's the definition of Promethium? Find Promethium meanings, definitions and more at the Real Dictionary online.
Promethium Meaning
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What's The Definition Of Promethium?
promethium in American English
a radioactive chemical element, one of the rare-earth elements, obtained from fission of uranium or neutron bombardment of neodymium and used in phosphorescent paint, as a power source, X-ray source, etc.: symbol, Pm; at. no., 61 noun: a rare-earth, metallic, trivalent element; at. no.: 61 promethium in British English noun: a radioactive element of the lanthanide series artificially produced by the fission of uranium. Symbol: Pm; atomic no: 61; half-life of most stable isotope, 145Pm: 17.7 years; valency: 3; melting pt: 1042°C; boiling pt: 2460°C (approx.) |
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