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    Periodic table anniversary When Swiss chemists were in their element

    Dmitri Mendeleev

    Dmitri Mendeleev, the father of the periodic table

    (Royal Society of Chemistry)

    Gadolinium, holmium and ytterbium. What are they and, for a bonus point, what have they got in common? On the 150th anniversary of the publication of the periodic table, we look at the properties and uses of the table’s three elements that were discovered by Swiss scientists.?

    On March 6, 1869, Dmitri Mendeleev presented his system of classifying the 63 known chemical elements to the Russian Chemical Society. As you will remember from your school days, the 118 elements todayexternal link are arranged by atomic number, electron configuration and recurring chemical properties.?

    However, for around 50 years certain elements were left off the table because they either were not pure enough or couldn’t be identified. Many of these were rare-earth elements (lanthanides), including the three “Swiss” elements.?

    Jean-Charles Galissard de Marignac, who taught chemistry at the Geneva Academy (since 1873 the University of Geneva), will be remembered for discovering ytterbium (Yb) in 1878 and gadolinium (Gd) in 1880. He also accurately calculated the atomic weight of many elements. For his efforts, he was awarded the prestigious Davy Medalexternal link in 1886, which had been given to Mendeleev four years earlier.?

    In 1878, two of de Marignac’s students, Jacques-Louis Soret?and?Marc Delafontaine, discovered holmium (Ho). Independently and at the same time, Swedish scientist Per Teodor Cleve discovered, isolated and described it.?

    Let’s examine gadoliniumexternal link, holmiumexternal link and ytterbiumexternal link closer:

    periodic table
    (Kai Reusser / www.x8pj.com)

    For all three elements, the top three producers are China, Russia and Malaysia?and the top three reserve holders are China, the CIS countriesexternal link (including Russia) and the US.

    www.x8pj.com

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    贵州十一选五开奖查询
  • 白岩松:世界杯将开幕 中国除了足球队没去其他都去了 2019-06-17
  • 滨河西路南延工程进入路基施工阶段 2019-06-14
  • 【世界杯·望俄打卦】突尼斯VS英格兰,“欧洲的中国队”英格兰是否突围 2019-06-10
  • 图解:关于世界杯开幕式的那点事 2019-06-07
  • ESL ONE云顶Newbee打破魔咒!击败Liquid夺冠 2019-06-07
  • 县名解析——黄河新闻网 2019-06-02
  • [视频]习近平打老虎动漫续集:当官要对自己狠一点 2019-06-02
  • 回复@学童2015:你的智商达不到搞懂这个问题的基本需求! 2019-06-01
  • 苗山脱贫影像志——父母在 不远行 2019-06-01
  • 山东2018年最低工资标准提高5.5% 2019-05-22
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  • 《鬼神童子》漫画家黑岩善宏因心肌梗塞于本月8日去世 2019-05-21
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