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Presented the idea of atoms
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Believed that everything was made up of fire, water, earth, and air. He did not believe the atom theory was
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Discovered air has weight and can push down a column of mercury.
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Came up with the Law of Conservation and started the conversation about what an atom is
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Proposed a "atomic theory" with spherical solid atoms based upon measurable properties of atoms
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Determined the charge to mass ratio of an electron and studied "canal rays"
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Oil drop experiment determined the charge and mass of an electron
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Turned an atom into a thin gold foil to study the nucleus. Assumed electrons were located on the outside of the nucleus
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Developed an explanation of atomic structure
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Proposed Principle of Indeterminacy; you cannot know both the position and velocity of a particle
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Viewed electrons as clouds and introduced "wave mechanics".
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Discovered the neutron