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Believed everything was composed of atoms too small to see
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Believed everything was made up the elements water, earth, air, and fire. However many times you cut something in half, there will always be a small piece
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Discovered what changes atmospheric pressure band created the barometer
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Found that atoms were indivisible and developed the law of conservation of mass
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Developed the atomic theory saying elements were made up of atoms, all atoms of the same element were identical, atoms cannot be created, destroyed, or divided, and atoms combine to create whole-number ratios of compounds
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Discovered the electron and developed the plum pudding model of the atom using a cathode ray experiment
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Conducted a gold-foil experiment and discovered the proton nucleus to create his nuclear model of the atom
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Discovered the charge and mass of the electron
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Discovered the electron orbitals and developed the planetary model
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Developed the theory of quantum mechanics
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Discovered the behavior of the electron to be as waves
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Discovered the neutron