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Introduction of the atom.
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Discovery of the proton.
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Discovery of the electron.
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Thompson Cathode Ray Discovery
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Robert Millikan's Charge of a Electron
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The Discovery of the Nucleus
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Nucleus
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Rutherford's Gold Foil Experiment Discovery
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Niels Bohr
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Electrons Orbitals
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Discovery of the Neutron
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Maria Goeppert-mayer