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The first introduction of the concept of an atom, and basically consisted of a singular, uncuttable tiny version of the original.
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Creator of the Law of Conservation and Mass.
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Came up with the concept that atoms were "discreet pockets of matter"
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Improved cathode ray research understanding that led to the discovery of electrons.
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Discovered nucleus and electrons through light experiments.
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Created Bohr model based on the mathematics achieved by great scientists/mathematicians of his time
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Came up with the quantum theory, which is that atoms are all just little clouds of dense neutrons, protons, and electrons.