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为了增强学生对周期律的指导作用的理解,我给他们介绍了元素镓的发现轶史。元素镓是法国化学家布瓦博德朗于1875年8月在比利牛斯山的闪锌矿中发现的,并测定了镓的一些性质。当伟大的化学家门捷列夫获悉后就写信给他:“……镓就是我预言的类铝元素,原子量接近68,比重在5.9左右,而不是4.7……。”可布瓦博德朗却认为比重为4.7是对的。他想:你在千里外的彼得堡,而且只有我手中才有世上第一块
In order to enhance students’ understanding of the guiding role of the periodic law, I introduced them to the history of the discovery of the elements. The elemental germanium was discovered by the French chemist Poitibo de Lange in the sphalerite of the Pyrenees in August 1875 and determined some properties of the germanium. When the great chemist Mendeleev was informed, he wrote to him: “... He is the aluminum-like element I predicted, with an atomic weight of approximately 68, and a weight of about 5.9 instead of 4.7.” However, it is correct that the ratio of 4.7 is correct. He thought: You are in Petersburg, thousands of miles away, and only I have the world’s first