columbium

Japanese: columbium
columbium

... Periodic table Element symbol = Nb Atomic number = 41 Atomic weight = 92.9064 Abundance in the earth's crust = 20 ppm (31st place) Stable nuclide abundance ratio 93 Nb = 100% Melting point = 2468°C Boiling point = 3300°C Specific gravity = 8.56 (25°C) Electron configuration = [Kr] 4d45s1 Main oxidation numbers = II, III, IV, V One of the vanadium group elements belonging to the VA group of the periodic table. In 1801, the British Charles Hatchett (1765-1847) discovered a new element in a mineral called columbite from Connecticut, USA, which was on display at the British Museum, and named it columbium. However, there were many objections to this, and it was considered to be the same element as tantalum. In 1844, however, Heinrich Rose (1795-1864) of Germany discovered another new element in columbite, along with tantalum, and because it resembled tantalum, he named it niobium after Niobe, the daughter of Tantalus in Greek mythology, from whom the word tantalum comes.

*Some of the terminology that mentions "columbium" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…周期表元素記号=Nb 原子番号=41原子量=92.9064地殻中の存在度=20ppm(31位)安定核種存在比 93Nb=100%融点=2468℃ 沸点=3300℃比重=8.56(25℃)電子配置=[Kr]4d45s1おもな酸化数=II,III,IV,V周期表第VA族に属するバナジウム族元素の一つ。1801年イギリスのハチェットCharles Hatchett(1765‐1847)は,大英博物館に陳列してあるアメリカのコネティカット州産のコロンブ石columbiteと呼ばれる鉱物中から新元素を発見し,コロンビウムcolumbiumと名づけた。しかしこれに対しては反論も多く,タンタルと同じ元素とされたが,44年ドイツのローゼHeinrich Rose(1795‐1864)はコロンブ石からタンタルとともに他の新元素を発見し,これがタンタルと似ていることから,タンタルの語源であるギリシア神話のタンタロスの娘ニオベNiobēにちなんでニオブと命名した。…

※「columbium」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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