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In addition to these valuable practical lessons in etching
Mendeleev on the Periodic Law oft-cited bookBy the dawn of the nineteenth century, "elements" had been defined as basic building blocks of nature resistant to decomposition by chemical means. In 1869, the Russian chemist Dmitri Ivanovich Mendeleev organized the discord of the elements into the periodic table, assigning each element to a row, with each row corresponding to an elemental category. The underlying order of matter, hitherto only dimly perceived, was suddenly clearly revealed. This is
