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Mendeleev's Periodic Table

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Dmitri Mendeleev invented a periodic table which ordered elements according to atomic weight.

Dmitri Mendeleev (Mendeleyev), a Russian chemist, was the first scientist to make a periodic table similar to the one we use today. Mendeleev noticed the elements exhibited periodic properties when they were arranged in order of increasing atomic weight.

from 1st English ed. of Mendeleev's Principles of Chemistry (1891, from the Russian 5th ed.)
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