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thulium    
n. 稀土金属元素,符号Tm,铥原子序69

稀土金属元素,符号Tm,铥原子序69

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}]

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]


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