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First to suggest atoms, stated they were tiny, invisible, and indestructible particles.
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Transformed Democritus’s ideas into a scientific theory. Also agreed all matter was created by atoms.
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Began work on the quantum theory.
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Created the first draft of the periodic table.
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Found evidence for a positively charged particle. Discovered because he observed a cathode-ray tube and saw the rays traveling in an opposite direction of the cathode rays. Found out about protons.
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He was the that discovered the electron, by performing experiments that passed an electric current through glasses at low pressure.
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Proposed that the atom is mostly empty space.
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Created a new theory for the structure of an atom. With this theory you could determine the atom’s chemical properties.
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Tried to find that quantity of charge carried by an electron. Managed to calculate the mass of the electron
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Made the theory of the Uncertainty Principle, where one can never know the location or energy of an electron at the same time.
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Confirmed the existence of the neutron.
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Had dissatisfaction of Bohr’s theory, and believe the atomic spectrum should be determined by a kind of eigenvalue problem
