![]() In 1869, Dmitri Mendeleev published a periodic table of all elements known at that time (he later predicted several new elements to complete the table, and corrected some atomic weights). He published articles about classification table of the elements in horizontal form (1864) and vertical form (1870), in which the series of periods are properly ended by an element of the alkaline earth metal group. Works on organizing the elements by atomic weight, until then had been stymied by the widespread use of equivalent weights for the elements, rather than atomic weights. His book, Die modernen Theorien der Chemie, which he began writing in Breslau in 1862 and which was published two years later, contained an early version of the periodic table containing 28 elements, classified elements into six families by their valence-for the first time, elements had been grouped according to their valence. Lothar Meyer's periodic table, published in "Die modernen Theorien der Chemie" (1864) According to him, if the atomic weights were plotted as ordinates and the atomic volumes as abscissae-the curve obtained a series of maxima and minima-the most electro-positive elements appearing at the peaks of the curve in the order of their atomic weights. Newlands did in England, that if the elements were arranged in the order of their atomic weights, they fell into groups of similar chemical and physical properties repeated at periodic intervals. ![]() Meyer is best known for his part in the periodic classification of the elements. In 1876, Meyer became Professor of Chemistry at the University of Tübingen, where he served until his death from a stroke on 11 April 1895 at the age of 64. In 1872, Meyer was the first to suggest that the six carbon atoms in the benzene ring (that had been proposed a few years earlier by August Kekulé) were interconnected by single bonds only, the fourth valence of each carbon atom being directed toward the interior of the ring.ĭuring the Franco-Prussian War, the Polytechnic was used as a hospital and Meyer took an active role in the care of the wounded. In 1866, Meyer accepted a post at the Eberswalde Forestry Academy at Neustadt-Eberswalde but two years later was appointed to a professorship at the Karlsruhe Polytechnic. Influenced by the mathematical teaching of Gustav Kirchhoff, he took up the study of mathematical physics at the University of Königsberg under Franz Ernst Neumann and in 1859, after having received his habilitation (certification for university teaching), became Privatdozent in physics and chemistry at the University of Breslau. With this interest in the physiology of respiration, he had recognized that oxygen combines with the hemoglobin in blood. in chemistry from the University of Breslau with a thesis on the effects of carbon monoxide on the blood. After graduating as a Doctor of Medicine from Würzburg in 1854, he went to the University of Heidelberg, where Robert Bunsen held the chair of chemistry. At Zurich, he had studied under Carl Ludwig, which had prompted him to devote his attention to physiological chemistry. Two years later, he studied pathology at the University of Würzburg as a student of Rudolf Virchow. After attending the Altes Gymnasium in Oldenburg, he studied medicine at the University of Zurich in 1851. He was the son of Friedrich August Meyer, a physician, and Anna Biermann. Meyer was born in Varel, Germany (then part of the Duchy of Oldenburg). ![]() Meyer never used his first given name and was known throughout his life simply as Lothar Meyer. The Russian chemist Dmitri Mendeleev (his chief rival) and he had both worked with Robert Bunsen. ![]() He was one of the pioneers in developing the earliest versions of the periodic table of the chemical elements. Julius Lothar Meyer (19 August 1830 – 11 April 1895) was a German chemist. ![]() University of Würzburg, University of Breslau ![]()
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