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1803 John Dalton

He proposed the atomic theory. He inferred proportions of elements in compounds. He found the atomic weight, and chemical symbols. He also had the most useful atomic theory of matter. To come up with this, he tested gases and used evaporation to find out what the gases had on that mixture all together.

http://redescolar.ilce.edu.mx/redescolar/efemerides/septiembre2001/interna/dalton.gif

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