J. J. Thomson discovered electrons and proposed the Plum Pudding Model, Ernest Rutherford discovered the nucleus, and Niels Bohr introduced the concept of electron orbitals.
J. J. Thomson discovered electrons in 1897 and proposed the Plum Pudding Model in 1904. Ernest Rutherford discovered the nucleus of the atom, showing positive charge concentrated at the center. Niels Bohr contributed the idea of electrons orbiting the nucleus in energy levels.
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