What model replaced the plum pudding model?

The plum pudding model was replaced by the Rutherford model of the atom. In 1911, Ernest Rutherford conducted his gold foil experiment, which demonstrated that atoms have a dense, positively charged nucleus surrounded by electrons. This shifted the understanding of atomic structure from the diffuse distribution of mass in the plum pudding model to a more concentrated nucleus with electrons orbiting around it, laying the groundwork for the modern atomic model.