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chemistry
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Updated 19 Sep 2017
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Created by
D'Kerrington Traylor
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Events
400BC Democritus Matter is made of small particles
1777 Antoine Lavoisier Mass is conserved in a chemical reaction
1803 John Dalton All matter is composed of atoms
1897 J.J. Thomson Discovered electrons
1909 Ernest Rutherford Discovered Protons in nucleus
1913 Niels Bohr Electrons had different energy levels
1926 Erwin Schrodinger Electron cloud model
1932 James Chadwick Discovered neutrons
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