Pm #
元素符号:Pm #
中文名称:钷
英文名称:Promethium
原子序数:61
原子量:(145)
外围电子排布:4f5 6s2
核外电子排布:2,8,18,23,8,2
常见化合价:+3
密度:6.475
溶点:1042
沸点:3000
所属周期:6
所属族数:IIIB
原子半径:2.62
离子半径:1.09(+3)
共价半径:1.63
同位素及放射性:Pm-147(放 β)
发现人:J.A. Marinsky, L.E. Glendenin, C.D. Coryell
发现时间:1945
发现地点:美国
名称由来:Named for the Greek god, Prometheus.
元素描述:Rare earth metal of synthetic origin on the earth, naturally made in stars.
元素来源:Does not occur naturally. Found among fission products of uranium, thorium, and plutonium.
元素用途:It has been used as a source of radioactivity for thickness-measuring gages.