Ernest Rutherford's atomic model introduced the concept of a nucleus with protons and electrons orbiting around it, contrasting the plum-pudding model.
Rutherford's atomic model, proposed after his famous Geiger-Marsden experiment in 1909, introduced the concept of a nucleus containing positively charged protons and most of the atom's mass, with electrons orbiting around it. This model contrasted with J. J. Thomson's plum-pudding model, which described atoms as a positive mass with negative electrons embedded in it.
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