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'''Ernest Rutherford''' performed experiments in which he fired alpha particles at thin gold foil.  His results showed that the positive charges of an atom are concentrated in its center.  This disproved the "Plum Pudding" model of the atom.

'''Ernest Rutherford''' performed experiments in which he fired alpha particles at thin gold foil.  His results showed that the positive charges of an atom are concentrated in its center.  This disproved the [[Plum Pudding]] model of the atom.