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400
democritus
Democritus claimed that everything is made up of atoms. -
Period: 400 to
scientist
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John Dalton
John Dalton discovered that elements are only able to combine atomically when they are in fixed ratios. -
J,J. Thompson
Thomson was the first to suggest that the fundamental unit was more than 1,000 times smaller than an atom, suggesting the subatomic particle now known as the electron.
