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was the first person to come up with the thought of a piece of matter that can't be divided into smaller parts, he called this the atom.
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Developed an atomic theory stating that spherical atoms had measurable properties of mass.
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Discovered the electron while using the cathode ray tube, to determine the charge to mass ratio of an electron.
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Performed the gold foil experiment to determine that the nucleus is a small, dense, , and positively charged part of the atom, based on the assumption that electrons are on the outside of the nucleus.
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