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Rutherford Model of the Atom Objective chapter 14 lesson 3 you will be able to explain qualitatively the significance of Rutherford’s discovery Gold Foil Experiment Rutherford was attempting to lend support to Thomsonʼs atomic model by sending a beam of massive alpha particles at a sheet of very thin (approximately 400 atoms thick) gold foil. Rutherford Results: Most of the particles went Some deflected at stated, “It was as if you fired a shell at tissue paper and it came back and hit you.” A study of the paths of the alpha particles revealed that they were curved rather than sharp. This lead him to believe that there was a large positive charge repelling the positively charged alpha particles. He said that it must be in the center of the atom and he called it the nucleus. How are the atoms held together? A charged particle in an electric field will have electric potential energy as follows. Work = Force x distance=∆E Example: Determine the potential energy of an alpha particle when it is 1.0 x 10-10 m from the gold nucleus. This model was not well received! Assignment Read p. 766-770 Do practice problems #1,2 p. 769 and check and reflect p.770 # 1-4