ni.o.bi.um
n.Symbol Nb （名词）符号 Nb A silvery, soft, ductile metallic element that occurs chiefly in columbite-tantalite and is used in steel alloys, arc welding, and superconductivity research. Atomic number 4; atomic weight 92.90'; melting point 2,4'8=C; boiling point 4,927=C; specific gravity 8.57; valence 2, 3, 5.See table at element 铌：一种象银的、柔软的、可延展的金属元素，主要存在于铌钽物中，用于钢铁合金、弧形焊接以及超导（电）性研究中。原子序数4；原子量92,90'；熔点2,4'8°C；沸点4,927°C；比重8.57；化合价2,3,5参见 element
来源：After Niobe [so called because it is extracted from tantalite] 源自 Niobe [以此命名是因为它从钽铁矿中提炼出来]
