J.J.+Thomson

J.J. Thomson [] [] [] Explain the importance of Thomson’s experimentation with the Cathode Ray Tube. He realized that their are streams of particles much smaller than atoms. These particles are called "corpuscles" and they make up the matter in the atoms themselves.

Summarize his model of the atom. The atom is composed of electrons surrounded by a soup of positive charge

Thomson’s model changed our view of the atom. Compare and contrast his model to Dalton’s model. What new knowledge did we gain? What was wrong with Dalton’s model? Did any of Dalton’s ideas continue to be valid?


 * Dalton || J.J. Thompson ||
 * [[image:http://www.kentchemistry.com/links/AtomicStructure/dalton_atom.gif width="164" height="163"]] || [[image:http://www.kentchemistry.com/links/AtomicStructure/plum.gif width="156" height="156"]] ||

Thomson added electrons to his model. He also illistrauted that the soup around the electrons had positive charge which neutralized the atom. This theory was later proven wrong by Ernest Rutherford.

Did any of Dalton's ideas continue to be valid? Yes, when Thomson suggested to his colleagues that cathode rays were material of atoms, later it was turned out to be correct.