英文字典中文字典51ZiDian.com
|
|
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] 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.
请选择你想看的字典辞典：
|
安装中文字典英文字典查询工具!
英文字典中文字典相关资料:
|
中文字典-英文字典 2005-2009