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Democritus asked, " If you break matter in half, then in half again, how many breaks would you have to make before you can break it no further?
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Dalton's atomic theory said that elements consisted of tiny particles called atoms.
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Rutherford discovered Alpha and Beta rays. ruthrford also conducted the famous Gold Foil Experiment.
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Discovered the electron in an atom.
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Millikan conducted an experiment that showed thata charge on a droplet of water from his experience alsways had a small, but finiye value.
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Made the model of the atom that is commonly used today and is taught today.
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Heisenberg created matrix mechanics, which is the first version of quantum mechanics.
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Shrodinger made a model of the atom min 1926, Shrodinger alsomade the wave function.
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Discovered basic Neutron by bombarding beryillium atoms with alpha particles.