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Thomson assumed there must be something in an atom that was positively charged that would neutralize the electrons negative charge. His proposal was a model for the atom that included a cloud of positive electricity in which the negatively charged electrons were embedded. His model is known as the Plum-Pudding Model of the atom. However, after an experiment performed by physicist Ernest Rutherford in 1909, Thomson's Plum-Pudding Model would become outdated.
Ernest Rutherford studied alpha particles or small pieces of positively charged matter. In an experiment, he fired alpha particles at a piece of gold foil, with a zinc sulfide screen behind it that would glow revealing the path of the alpha particle...
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