J.J. Thomson's model of the atom could not explain the results of alpha particle scattering experiment carried out by Rutherford. According to Thomson’s model atom was considered as a sphere which was positively charged and electrons were embedded in it. It could not explain why most of the positively charged alpha particles passed straight through the gold foil. It also failed to explain the deflections and rebounding of the alpha particles .

J. J. Thomson's model of the atom was just based on imagination. It did not have any experimental evidence to support unlike the Rutherford's model of the atom.