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Thomson the discoverer of the electron was friendly but uninterested. In 1911 Niels Bohr went to Cambridge, hoping to talk physics with J. Thomsons seemingly naive models actually contained some of the fundamental ideas of Niels Bohrs revolutionary quantum theory of the atom. In 1908, Ernest Rutherford, a former student of Thomson's, proved Thomson's raisin bread structure incorrect. Far from being merely scientific curiosities, J. These particles were later named electrons.Īfter Eugen Goldstein's 1886 discovery that atoms had positive charges, Thomson imagined that atoms looked like pieces of raisin bread, a structure in which clumps of small, negatively charged electrons (the "raisins") were scattered inside a smear of positive charges. Scientists had now established that the atom was not indivisible as Dalton had believed, and due to the work of Thomson, Millikan, and others, the charge and mass of the negative. Thomson theorized, and was later proven correct, that the stream was in fact made up of small particles, pieces of atoms that carried a negative charge. Mass of electron 1.602×1019C× 1kg 1.759×1011C 9.107×1031kg Mass of electron 1.602 × 10 19 C × 1 kg 1.759 × 10 11 C 9.107 × 10 31 kg.
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Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. For years scientists had known that if an electric current was passed through a vacuum tube, a stream of glowing material could be seen however, no one could explain why. Thomson's notion of the electron came from his work with a nineteenth century scientific curiosity: the cathode ray tube. Thomson's work suggested that the atom was not an "indivisible" particle as John Dalton had suggested but a jigsaw puzzle made of smaller pieces. Thomson dramatically changed the modern view of the atom with his discovery of the electron.