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First philosopher and first person to think about what the world was made of
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Believed everything was made of water, fire, air, and earth.
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First person to think of a small, undividable particle - the atom
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First experiments, created laws of motion
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Major contributor to atomic theory
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Plum Pudding Model, Cathode Ray Tube
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Oil drop experiment, found mass of electron
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Gold foil experiment, discovered proton and the nucleus
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Developed Bohr model, thought electrons traveled in orbits
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Discovered isotopes, mass spectrogram experiment
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Discovered Electron clouds
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Uranium experiment, discovered radioactivity