…In 1794, Johann Gadolin of Finland discovered a new oxide in a mineral from Ytterby near Stockholm, Sweden. He named it ytterbia after the place of origin, but later it came to be called yttrium (the oxide of yttrium). In 1843, Carl Gustav Mosander of Sweden succeeded in separating this yttrium into three components (yttrium, terbia, and erbia), retaining the old name yttrium for the element derived from one of the components, yttrium, and giving the names terbium and erbium to the two elements derived from terbia and erbia, respectively. The main ores are gadolinite, monazite, and xenotime. … From [Erbium]... Periodic table Element symbol = Er Atomic number = 68 Atomic weight = 167.26 ± 3 Abundance in the earth's crust = 2.8 ppm (45th place) Stable nuclide abundance ratio 162Er = 0.136%, 164Er = 1.56%, 166Er = 33.41%, 167Er = 22.94%, 168Er = 27.07%, 170Er = 14.88% Melting point = 1522 °C Boiling point = 2510 °C Specific gravity = 9.051 Electron configuration = [Xe] 4f 12 5d 0 6s 2 Main oxidation number = III One of the lanthanides, a rare earth element belonging to group IIIA of the periodic table. 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 simply 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-day erbium was established. *Some of the terminology that mentions "Mosander, CG" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…1794年フィンランドのガドリンJohann Gadolinは,スウェーデンのストックホルム近郊イッテルビーYtterby産の鉱物から新しい酸化物を発見し,産地にちなんでイッテルビアとよんだが,のちイットリア(イットリウムの酸化物の意)とよぶようになった。1843年スウェーデンのモサンデルCarl Gustav Mosanderはこのイットリアを3成分(イットリア,テルビア,エルビア)に分けることに成功し,その一つであるイットリアから得られた元素に旧名イットリウムを保留し,テルビア,エルビアから得られた2元素にそれぞれテルビウム,エルビウムの名を与えた。主要鉱石はガドリン石,モナザイト,ゼノタイムなど。… 【エルビウム】より…周期表元素記号=Er 原子番号=68原子量=167.26±3地殻中の存在度=2.8ppm(45位)安定核種存在比 162Er=0.136%,164Er=1.56%,166Er=33.41%,167Er=22.94%,168Er=27.07%,170Er=14.88%融点=1522℃ 沸点=2510℃比重=9.051電子配置=[Xe]4f125d06s2 おもな酸化数=III周期表第IIIA族に属する希土類元素のうちのランタノイドの一つ。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。… ※「Mosander,C.G.」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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