Tm
元素符号:Tm
中文名称:铥
英文名称:Thulium
原子序数:69
原子量:168.9
外围电子排布:4f13 6s2
核外电子排布:2,8,18,31,8,2
常见化合价:+3
密度:9.33
溶点:1545
沸点:1950
所属周期:6
所属族数:IIIB
原子半径:2.42
离子半径:1.09(+3)
共价半径:1.56
同位素及放射性:Tm-169
发现人:Per Theodor Cleve
发现时间:1879
发现地点:瑞典
名称由来:From Thule ancient name of Scandinavia.
元素描述:Soft, malleable, ductile, silvery metal
元素来源:Found with other rare earths in the minerals gadolinite, euxenite, xenotime, and monazite. Monazite is often 50% rare earth by weight and 0.007% thulium.
元素用途:Radioactive thulium is used to power portable x-ray machines, eliminating the need for electrical equipment.