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In 1908, Hans Geiger and Ernest Marsden demonstrated that alpha particles occasionally scatter at large angles, a result inconsistent with Thomson's model.In 1911 Ernest Rutherford developed a new scattering model, showing that the observed large angle scattering could be explained by a compact, highly charged mass at the center of the atom.Rutherford scattering did not involve the electrons and thus his model of the atom

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