lutetium(redirected from Cassiopium)
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lu·te·ti·umalso lu·te·ci·um (lo͞o-tē′shē-əm)
n. Symbol Lu
A silvery-white element of the lanthanide series that is exceptionally difficult to separate from the other rare-earth elements with which it is found, used in nuclear technology. Atomic number 71; atomic weight 174.97; melting point 1,663°C; boiling point 3,402°C; specific gravity 9.841 (at 25°C); valence 3. See Periodic Table.
[Latin Lutetia, ancient name of Paris, France (where it was discovered) + -ium.]
(Elements & Compounds) a silvery-white metallic element of the lanthanide series, occurring in monazite and used as a catalyst in cracking, alkylation, and polymerization. Symbol: Lu; atomic no: 71; atomic wt: 174.967; valency: 3; relative density: 9.841; melting pt: 1663°C; boiling pt: 3402°C
[C19: New Latin, from Latin Lūtētia ancient name of Paris, home of G. Urbain (1872–1938), French chemist, who discovered it]
lu•te•ti•um(luˈti ʃi əm)
a trivalent rare-earth element. Symbol: Lu; at. wt.: 174.97; at. no.: 71.
Symbol Lu A silvery-white metallic element of the lanthanide series that is used in nuclear technology. Its radioactive isotope is used to find the age of meteorites. Atomic number 71. See Periodic Table.
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|Noun||1.||lutetium - a trivalent metallic element of the rare earth group; usually occurs in association with yttrium|