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mar 31, 1803 - John Dalton's Atomic Model: In 1803, scientist John Dalton proposes that all matter is made of tiny particles called atoms. At this time protons, electrons, and neutrons were unknown and the atom was only a sphere, an almost identical model to the one made in 450 BC by the Greek scientist and philosopher Democritus.

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Date:

mar 31, 1803
Now
~ 215 years ago
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