| 单词 | niobium |
| 释义 | Word Frequency niobium(naɪˈəʊbɪəm) noun a ductile white superconductive metallic element that occurs principally in columbite and tantalite: used in steel alloys. Symbol: Nb; atomic no: 41; atomic wt: 92.90638; valency: 2, 3, or 5; relative density: 8.57; melting pt: 2469±10°C; boiling pt: 4744°C Former name: columbiumWord origin C19: from New Latin, from Niobe (daughter of Tantalus), so named because it occurred in tantalite |
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