Dmitri Ivanovich Mendeleev (February 8, 1834, February 2, 1907) was a Russian chemist, inventor and credited as being the creator of the first version of the periodic table of elements. 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). As he attempted to classify the elements according to their chemical properties, he noticed patterns that led him to postulate his periodic table which described elements according to both atomic weight and valence. | |
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