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300
Democritus' Theory
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Period: 300 to
Scientists
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350
Aristotle's Theory
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John Newlands Publishes Law of Octaves
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Crookes Tube Invented
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Dalton's Discoveries
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JJ Thomson Discovers Electron
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Rutherford Splits Atom
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Bohr Wins Nobel Prize for Atomic Model
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Chadwick Discovers Neutron
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Chadwick Discover's Neutron
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Mendeleev Created First Version of Periodic Table