Physics Glossary Definition (English)
Atom, Models Of Defined
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"After the discovery of the electron (see Thompson) but before the discovery of the nucleus (see Rutherford), the model of the atom was the plum pudding model in which the electrons were envisioned as plums in the pudding of protons. (Neutrons were not known to exist at the time.) After Rutherford's experiments, the model became known as the nuclear atom, the precursor to the picture of today. That the positively-charged nucleus is so small (in defiance of the electrical force which should tear the nucleus apart to separate the positive charges) was one of the clues that classical mechanics was incomplete, heralding the birth of quantum mechanics."
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