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promethium

   Also found in: Dictionary/thesaurus, Financial, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
promethium /pro·me·thi·um/ (Pm) (-me´the-um) chemical element, at. no. 61.
pro·me·thi·um (pr-mth-m)
n. Symbol Pm
A radioactive rare-earth element prepared by fission of uranium. Pm 145 is the longest-lived isotope with a half-life of 17.7 years. Atomic number 61.
promethium (Pm)
[-mē′thē·əm]
Etymology: L, Prometheus, mythic character who gave fire to humans
a radioactive rare earth metallic element. Its atomic number is 61; its atomic mass is 145.
promethium (Pm) [pro-me´the-um]
a chemical element, atomic number 61, atomic weight 147. (See Appendix 6.)
promethium
a chemical element, atomic number 61, atomic weight 147, symbol Pm. See Table 6.
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They’re generally clustered in a separate grouping at the bottom of the table, are known collectively as the lanthanoids, and these are their names, in order of atomic number (57-70): lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, and ytterbium.
Why all the fuss over rare earths? by Doug Hornig / Stockhouse
For the transmitter side, Mahlo offers three different low-energy isotopes for films of different thicknesses: promethium for up to 10 mils, krypton for up to 40 mils, and strontium for up to 250 mils.
NPE news in extrusion by Schut, Jan H. / Plastics Technology
His strength was becoming promethium As he tried very hard to throw me the, urn, The money to buy fresh samarium, But Uri was no Good Samaritum.
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