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Aristotle believed that atoms did not exist.
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Dalton created the atomic model and proved that atoms exist as a solid sphere, although he had no knowledge of protons and neutrons.
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Thomson conducted the Cathode Ray Tube Experiment and proved that atoms have electrons with a negative charge.
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Rutherford conducted the Gold Foil Experiment and proved that the center of the atom is dense and has a positive charge.
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Bohr created the Electron Cloud Model and proved that electrons travel around the nucleus in a cloud.
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Schrodinger explained the movement of electrons in an atom.
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Chadwick discovered the neutron.
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Heisenberg created the neutron-proton model of the nucleus.
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Democritus believed that atoms are indivisible.
