Cleve, PT (English spelling) ClevePT

Japanese: Cleve,P.T.(英語表記)ClevePT
Cleve, PT (English spelling) ClevePT

…In 1843, Carl Gustav Mosander of Sweden discovered that yttrium, which had been considered an element until then, could be divided into three elements, one of which he named yttrium, and the others terbium and erbium, named after the place name Ytterby, from which yttrium was derived. However, in 1879, Per Theodor Cleve of Sweden discovered that erbium could be further divided into three elements, one of which he named erbium, and the other two holmium and thulium, and the modern name erbium was established. The main ores are gadolinite, xenotime, and fergusonite. …

From [Holmium]

…Periodic table Element symbol = Ho Atomic number = 67 Atomic weight = 164.9304 Abundance in the earth's crust = 1.2 ppm (55th place) Stable nuclide abundance ratio 165 Ho = 100% Melting point = 1461°C Boiling point = 2600°C Specific gravity = 8.803 Electron configuration = [Xe] 4f 11 5d 0 6s 2 Main oxidation number = III A lanthanide belonging to the rare earth elements in group IIIA of the periodic table. The Swedish PT Cleve (1840-1905) worked on the analysis of rare earth elements and in 1879 discovered two other elements from erbium, which had been thought to be a single element until then, and named one thulium and the other holmium after his hometown, Stockholm. The main ores are monazite and xenotime, and it is one of the rarest elements among the lanthanides. …

*Some of the terminology that mentions "Cleve, PT" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…1843年スウェーデンのモサンデルCarl Gustav Mosanderは,それまで元素とされていたイットリウムが三つの元素に分けられることを見いだし,一つはそのままイットリウムとし,他はイットリウムの名称のもととなった地名イッテルビーYtterbyにちなんでテルビウムとエルビウムとした。しかし79年スウェーデンのクレーベPer Theodor Cleveは,エルビウムがさらに三つの元素に分けられることを見いだし,一つはエルビウム,他の二つはホルミウムとツリウムと名づけ,現在のエルビウムが確立された。主要鉱石はガドリン石,ゼノタイム,フェルグソン石など。…

【ホルミウム】より

…周期表元素記号=Ho 原子番号=67原子量=164.9304地殻中の存在度=1.2ppm(55位)安定核種存在比 165Ho=100%融点=1461℃ 沸点=2600℃比重=8.803電子配置=[Xe]4f115d06s2 おもな酸化数=III周期表第IIIA族,希土類元素に属するランタノイドの一つ。スウェーデンのクレーベP.T.Cleve(1840‐1905)は,希土類元素の分析に取り組み,1879年に,それまで単一元素と思われていたエルビウムから他の二つの元素を見いだし,一つをツリウム,一つを彼の故郷ストックホルムにちなんでホルミウムと命名した。主要鉱石はモナザイト,ゼノタイムなどで,ランタノイド中最も希産の元素の一つである。…

※「Cleve,P.T.」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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