P2 6.2 The Discovery of the Nucleus

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  • The Discovery of the Nucleus
    • Plum pudding model
      • Scientists originally believed that atoms were spheres of positive charge with electrons stuck in them
        • Similar to a plum pudding
    • Alpha particle scattering experiment
      • Conducted by Rutherford, Geiger and Marsden
      • Fired alpha particles at thin gold foil
      • Most particles passed through the foil
        • Suggests that most of the atom is just empty space
      • Some particles were deflected at small angles
        • Suggests that the nucleus has a positive charge
      • A few particles rebounded through very large angles
        • Suggests that the nucleus has a large mass and a very large positive charge

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