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Joseph John Thompson

Joseph John Thompson. By: Cory Bair, Nick Nyce, Nick Shizzle. History. In 1987 he discovered the electron in a series of experiments. These experiments were to study the electrons discharge in a high-vacuum cathode ray tube. Theory.

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Joseph John Thompson

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  1. Joseph JohnThompson By: Cory Bair, Nick Nyce, Nick Shizzle

  2. History • In 1987 he discovered the electron in a series of experiments. These experiments were to study the electrons discharge in a high-vacuum cathode ray tube.

  3. Theory • The particle inside a positive charged matter were negative. He called these particles electrons.

  4. Helpful Theories • Dalton’s-Dalton’s theory helped out because it stated that all elements are made up of atoms • Thomson’s helped Rutherford’s theory because it helped him with more experimentation. Rutherford found that Thomson was initiallywrong.

  5. Theories-Experiments • Rutherford performed many experiments with radioactive alpha particles. • Rutherford created the atom. • J.J. Thomson created the electron • Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. • 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. These particles were later named electrons.

  6. Rutherford • Rutherford proposed a revolutionary view of the atom. He suggested that the atom consisted of a small, dense core of positively charged particles in the center (or nucleus) of the atom, surrounded by a swirling ring of electrons. • The nucleus was so dense that the alpha particles would bounce off of it, but the electrons were so tiny, and spread out at such great distances, that the alpha particles would pass right through this area of the atom.

  7. Rutherford’s Example • Gold Foil • The atom resembled a tiny solar system with the positively charged nucleus always at the center and the electrons revolving around the nucleus.

  8. Electrons • Thomson discovered electrons from his work with a nineteenth century scientific curiosity: the cathode ray tube.

  9. Atoms • Atoms are very small. • Atom contains one Electron, Proton, Neutron. • Atoms of different elements are characterized by their number of protons. • The number of protons are constant for all atoms of a single element; the number of neutrons and electrons can vary

  10. Works Cited • http://www.visionlearning.com/library/module_viewer.php?mid=50

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