Pr
元素符号:Pr
中文名称:镨
英文名称:Praseodymium
原子序数:59
原子量:140.9
外围电子排布:4f3 6s2
核外电子排布:2,8,18,21,8,2
常见化合价:+3
密度:6.77
溶点:931
沸点:3520
所属周期:6
所属族数:IIIB
原子半径:2.67
离子半径:1.13(+3)
共价半径:1.65
同位素及放射性:Pr-141
发现人:C.F. Aver von Welsbach
发现时间:1885
发现地点:奥地利
名称由来:Greek: prasios and didymos (green twin); from its green salts.
元素描述:Silvery white, moderately soft, malleable, ductile metal.
元素来源:Obtained from same salts as neodymium.
元素用途:Used with neodymium to make lenses for glass maker's goggles since it filters out the yellow light present in glass blowing. Alloyed with magnesium creates a high-strength metal used in aircraft engines. Makes up 5% of Mich metal.