Thomson's Model vs. Rutherford's Model
Top: Expected results -- alpha particles pass through the plum pudding model of the atom undisturbed. Bottom: Observed results -- a small portion of the particles were deflected, indicating a small, concentrated positive charge. (Note that the image is not to scale; in reality the nucleus is vastly smaller than the electron shell. )
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"Geiger-Marsden experiment."
http://en.wikipedia.org/wiki/Geiger-Marsden_experiment
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