terbium(redirected from Element 65)
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n. Symbol Tb
A soft, silvery-gray metallic element of the lanthanide series, extracted chiefly from monazite, used in high-temperature fuel cells as a stabilizer, in alloys responsive to a magnetic field, and in x-ray machines and lasers. Atomic number 65; atomic weight 158.925; melting point 1,356°C; boiling point 3,230°C; specific gravity 8.230; valence 3, 4. See Periodic Table.
[After Ytterby, a town in Sweden.]
(Elements & Compounds) a soft malleable silvery-grey element of the lanthanide series of metals, occurring in gadolinite and monazite and used in lasers and for doping solid-state devices. Symbol: Tb; atomic no: 65; atomic wt: 158.92534; valency: 3 or 4; relative density: 8.230; melting pt: 1356°C; boiling pt: 3230°C
[C19: from New Latin, named after Ytterby, Sweden, village where it was discovered]
ter•bi•um(ˈtɜr bi əm)
a rare-earth, metallic element present in certain minerals and yielding colorless salts. Symbol: Tb; at. no.: 65; at. wt.: 158.924; sp. gr.: 8.25.
[1843; (Yt)terb(y), a town in Sweden, source of rare earth–containing minerals + -ium2; compare ytterbium]
Symbol Tb A soft, easily shaped, silvery-gray metallic element of the lanthanide series. It is used in color television tubes, x-ray machines, and lasers. Atomic number 65. See Periodic Table.
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|Noun||1.||terbium - a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite|
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
apatite - a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus
gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium