Dmitri Mendeleev, Periodic Table Draft, 1869

Numéro d’image : 12651588
Dmitri Mendeleev, Periodic Table Draft, 1869
Mendeleev's first periodic table. Dating from 1869, these notes show the early concept of a periodic table of the elements. He left gaps in the table for new elements, that were indeed later discovered, vindicating his theory. This version has the elements listed using chemical symbols, and ordered by atomic weight, but the fully correct chemical arrangement has not yet emerged. Dmitri Ivanovich Mendeleev (February 8, 1834, February 2, 1907) was a Russian chemist and inventor. Using the table, he predicted the properties of elements yet to be discovered. In 1863 there were 56 known elements with a new element being discovered at a rate of approximately one per year. After becoming a teacher, Mendeleev wrote the definitive textbook of his time: Principles of Chemistry (two volumes, 1868-70).
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