W
元素符号:W
中文名称:钨
英文名称:Wolfram
原子序数:74
原子量:183.8
外围电子排布:5d4 6s2
核外电子排布:2,8,18,32,12,2
常见化合价:+2,+3,+4,+5,+6
密度:19.3
溶点:3410
沸点:5660
所属周期:6
所属族数:VIB
原子半径:2.02
离子半径:0.60(+6)
共价半径:1.30
同位素及放射性:W-180 W-182 W-183 *W-184 W-186
发现人:Fausto and Juan Jos?de Elhuyar
发现时间:1783
发现地点:西班牙
名称由来:Swedish: tung sten (heavy stone): symbol from its German name wolfram.
元素描述:Hard, steel-gray to white metal. Highest melting point of all metals.
元素来源:Occurs in the minerals scheelite (CaWO4) and wolframite [(Fe,Mn)WO4].
元素用途:Made into filaments for vacuum tubes and electric lights. Also as contact points in cars. Combined with calcium or magnesium it makes phosphors. Tungsten carbide is extremely hard and is used for making cutting tools and abrasives.