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1879年Д.И.门捷列夫在给一位瑞典科学家的信中,对证实周期律的正确性的研究工作作总结时,曾指出:“若钪即类硼,即在已清楚知道的这一系列密集的元素中,现在只有类硅尚未发现。它的发现,将是特别有趣的。”门捷列夫在另一个地方写道:“我认为,在那些毫无疑问地是尚未找到的金属中,属于第Ⅳ族和第三列的碳的同族元素是最有兴趣的一种金属。”周期系表的第一个草案表明:门捷列夫曾特别注意的,正是这一元素——类硅,即后来的锗。在这张表上的纸角有一附记,包括一系列的第四族元素,并指出它们的原子量和它们之间的差。以X表示类硅,并且算出了它的近似原子量。这种情况给我们充分的理由肯定说,正如Б.М.克得罗夫(Кедров)
In his letter to a Swedish scientist in 1879, Mendeleev concluded a study of the correctness of the periodic law, stating: “If scandium is boron-like, it is already known Only a class of silicon has yet to be discovered in this dense series of elements, and its discovery would be particularly interesting. ”Mendeleev wrote in another place:“ I think there is no doubt that those who have not yet been found Of the metals belonging to the fourth and fourth columns of carbon are the metals of most interest. ”The first draft of the periodic table shows that it was Mendeleev’s particular attention to this Elemental - silicon-like, later germanium. The paper corner on this watch has an appendix that includes a series of elements of the fourth group and indicates their atomic weight and the difference between them. The silicon is represented by X, and its approximate atomic weight is calculated. This situation gives us good reason to affirm that, just as Б.М. Кедров