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Friedrich August Kekulé von Stradonitz

Friedrich August Kekulé, later Friedrich August Kekule von Stradonitz (German pronunciation: [ˈfriːdrɪç ˈaʊɡʊst ˈkekuːle fɔn ʃtraˈdoːnɪts]) (7 September 1829 – 13 July 1896) was a German organic chemi ...

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Richard Abegg

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 ...