1 jan 1803 ano - John Dalton Atomic Theory, 1803

Descrição:

John Dalton, a chemist and schoolteacher, used experimental methods to build on Democritus' theory. He discovered atoms are in motin, and are spherical in shape. His theory included
1. All matter is mad up of atoms which are indivisible and indestructible in nature
2. All atoms of a given element are identical in all properties
3. Atoms of different element physically or chemically mixed together create compounds
4. A chemical reaction is the result of atoms being joined, rearranged, or seperated

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