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A greek philosopher that the universe was made of tiny "uncuttable" particle

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Hypothesized that the atom was a tiny hard sphere. Created the atomic theory and believed that atoms of a given element are identical.

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Determined that the properties of elements are periodic (or in trends) and created the first periodic table

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discovered the electron, used the cathode ray tube in his discovery. Also created the "plum pudding) model of the atom

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did the gold foil experiment, discovered that the atom is mostly empty space and that protons had a positive charge.

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Created a model of the atom with electrons moving around the nucleus in fixed orbits and worked with the quantum theory

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created the uncertainty principle( a particle's position, energy and time can never be precisely known)

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discovered the neutron, and found the missing mass of atoms nucleus