Dmitri Mendeleev (TABLE; He described elements according to both atomic weight (now called relative atomic mass) and valence.) (1 jan 1869 ano – 18 maio 1869 ano)

Descrição:

As he attempted to classify the elements according to their chemical properties, he noticed patterns that led him to postulate his periodic table; he claimed to have envisioned the complete arrangement of the elements in a dream.

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