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thulium

n. 稀土金屬元素,符號Tm,銩原子序69

稀土金屬元素,符號Tm,銩原子序69

WordNet (r) 3.0 (2006) (WordNet)

thulium
n 1: 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 [synonym: {thulium}, {Tm}, {atomic number 69}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Thulium \Thu"li*um\, n. [NL. See {Thule}.] (Chem.)
A rare metallic element of the lanthanide group having atomic
number 69, and atomic weight 168.93. It is found in the
mineral gadolinite and other minerals, together with other
rare earths. For more information see the data from
ChemGlobe.
[1913 Webster PJC]

The Elements Database (element)

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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