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Richard Wilhelm Heinrich Abegg (January 9, 1869 – April 3, 1910) was a German chemist and pioneer of valence theory. He proposed that the difference of the maximum positive and negative valence of an element tends to be eight. This has come to be known as Abegg's rule. He was a gas balloon enthusiast, which caused his death at the age of 41 when he crashed in his balloon in Silesia. Abegg received his PhD on July 19, 1891 as the student of August Wilhelm von Hofmann at the University of Berlin. Abegg learned organic chemistry from Hofmann, but one year after finishing his PhD degree he began researching physical chemistry while studying with Friedrich Wilhelm Ostwald in Leipzig, Germany. Abegg later served as private assistant to Walther Nernst at the University of Göttingen and to Svante Arrhenius at the University of Stockholm. Abegg discovered the theory of freezing-point depression and anticipated Gilbert Newton Lewis's octet rule by revealing that the lowest and highest oxidation states of elements often differ by eight. He researched many topics in physical chemistry, including freezing points, the dielectric constant of ice, osmotic pressures, oxidation potentials, and complex ions. ==Personal life and education== Richard Abegg was the son of Wilhelm Abegg and Margarete Friedenthal. He had a brother, Wilhelm Abegg, who became the Prussian Secretary of State.〔 After attending Wilhelm High School in Berlin, Abegg studied organic chemistry at the University of Kiel and the University of Tübingen. He then attended the University of Berlin, from which he received his doctorate as the student of August Wilhelm von Hofmann. In 1895, he married Line Simon, who became also a ballooning enthusiast. Abegg occupied himself with photography and balloon excursions. He was the initiator and chairperson of the Silesian Club for Aeronautics in Breslau. Furthermore, he had an assessor's function with the presidency of the German Air Sailors' Association. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Richard Abegg」の詳細全文を読む スポンサード リンク
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