Plum pudding model
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In physics, the Plum pudding model of the atom was proposed by J. J. Thomson, the discoverer of the electron, before the discovery of the proton or neutron. In this model, the atom is composed of electrons surrounded by a soup of positive charge, like plums surrounded by pudding. The electrons were thought to be positioned uniformly throughout the atom. Instead of a soup, the atom was also sometimes said to have had a cloud of positive charge. The model was disproved by Ernest Rutherford's gold foil experiment, when he discovered the nucleus of the atom, thus leading to the Rutherford model of the atom.
This model can be compared to a British treat called plum pudding, hence the name. It is also known as the chocolate chip cookie model.
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