Lothar Meyer (TABLE; 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.) (jan 1, 1864 – sep 2, 1872)

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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. 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.

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