Based on Thompson's plum pudding model, Rutherford expected that all the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom.
According to Thompson's model of the atom, the atom is a sphere of positively charged matter into which negative charges were embedded.
Based on this model, Rutherford expected that all the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom.
However, some alpha particles passed through, some deflected through large angles while some bounced back.
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