niobium / naɪˈoʊ bi əm /

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niobium 的定义

n. 名词 noun

Chemistry.

  1. a steel-gray metallic element resembling tantalum in its chemical properties; becomes a superconductor below 9 K; used chiefly in alloy steels. Symbol: Nb; atomic number: 41; atomic weight: 92.906; specific gravity: 8.4 at 20°C.

更多niobium例句

  1. The oxide of niobium dissolved in a bead of microcosmic salt gives a bluish colour in the reducing flame.
  2. The corresponding group consists of nitrogen, vanadium and niobium; they are triatomic, paramagnetic, and negative.
  3. Chemically related to vanadium are the two elements tantalum and columbium or niobium.
  4. But the knowledge was very imperfect; neither was it much clarified by H. Rose, who regarded niobium oxide as the element.