![]() Pudding is bread like food in which plum (fruit) is embedded or evenly distributed. In 1908, Ernest Rutherford, a former student of Thomson's, proved Thomson's raisin bread structure incorrect. Cathode-ray tube experiment in which negatively charged particles were observed led to J.J Thomson's Plum Pudding model of the atom. In order to do this, Thomson utilized an electrometer. 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. Thomsons first experiment with cathode ray tubes set out to discover if the electric charge was something separate from the cathode rays. 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. Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. ![]() Three experiments led him to this.: irst, in a variation of an 1895 experiment by Jean Perrin, Thomson built a cathode ray tube ending in a pair of metal cylinders with a. When the ray was bent, no electric charge could be detected at the other end. 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. He advanced the idea that cathode rays are really streams of very small pieces of atoms. 1st Experiment Thomson put a magnetic field around the cathode ray tube. ![]() 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.
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