The Plum pudding model reference article from the English Wikipedia on 24-Jul-2004
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Plum pudding model

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The Plum pudding model of the atom was made after the discovery of the electron but before the discovery of the proton or neutron. In it, the atom is envisioned as electrons surrounded by a soup of positive charge, like plums surrounded by pudding. This model was disproved by an experiment by Ernest Rutherford when he discovered the nucleus of the atom.

See also: Rutherford scattering, atom