按主题分类的文章 "Niobium"

1. Niobium
   发布于 2025年4月1日

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   Niobium and columbium are interchangeable names for the chemical element possessing the atomic number 41. In 1801, it was named columbium, whereas in 1950, the International Union of Pure and Applied Chemistry officially designated it as niobium (Nb).