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thulium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Thulium \Thu"li*um\, n. [NL. See {Thule}.] (Chem.) A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite. From WordNet r 1.6 [wn]: thulium n : a soft silvery metallic element of the rare earth group isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime [syn: {Tm}, {atomic number 69}] From Elements database 20001107 [elements]: thulium Symbol: Tm Atomic number: 69 Atomic weight: 168.934 Soft grey metallic element that belongs to the lanthanoids. One natural isotope exists, Tm-169, and seventeen artificial isotopes have been produced. No known uses for the element. Discovered in 1879 by Per Theodor Cleve.
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