yt.ter.bi.um
n.Symbol Yb （名词）符号 Yb A soft, bright, silvery rare-earth element occurring in two allotropic forms and used as an x-ray source for portable irradiation devices, in some laser materials, and in some special alloys. Atomic number 70; atomic weight 73.04; melting point 824=C; boiling point ,9'=C; specific gravity '.972 or '.54 (25=C) depending on allotropic form; valence 2, 3.See table at element 镱：一种柔软、明亮的银色稀土元素，存在于两种同素异形体中，被用作便携式的放射线治疗设备的X射线源，也用于一些激光物质和特殊合金中。原子序数70；原子量73.04；熔点824=C；沸点,9'=C；比重依两种同素形体'.972或'.54(25=C)；化合价2,3参见 element
来源：After Ytterby , a town in Sweden 源自 依特白 ，瑞典一城镇
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