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J.J. Thomson

J.J. Thomson. The Plum Pudding or Raisin Bun Model. The Problem…. Dalton Model Matter consists of tiny particles, atoms The Particles are indestructible Atoms of each element have a different mass Atoms react and combine in simple whole number ratios. Atoms are

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J.J. Thomson

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  1. J.J. Thomson The Plum Pudding or Raisin Bun Model

  2. The Problem… • Dalton Model • Matter consists of tiny particles, atoms • The Particles are indestructible • Atoms of each element have a different mass • Atoms react and combine in simple whole number ratios Atoms are one indivisible sphere.

  3. The Design… • Cathode ray tube • Electrometer • Magnets

  4. The Experiment & Evidence • Actually there were three 1) Using the cathode ray tube and the electrometer, no charge was indicated unless the ray was deflected towards the electrometer The charge is a property of the ray.

  5. The Experiment & Evidence 2) Using the cathode ray tube and magnets, he deflected the ray The deflection direction indicates a negative charge.

  6. The Experiment & Evidence 3) Thomson measures the mass-to-charge ratio of the rays by measuring how much it is deflected by the magnetic field & how much energy it carried The ratio is 1,000 times smaller than that of the H+, these particles have less mass then the lightest atom known.

  7. The New Model… • Suggested a sphere of positive matter • “Corpuscles” = negative charge • Positioned in the Positive matter by electrostatic forces • A jigsaw of smaller pieces • Making up the atom

  8. Bibliography • http://www.chemheritage.org/classroom/chemach/atomic/thomson.html, retrieved June 15, 2009 • http://nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html • http://www.atomicarchive.com/Bios/Thomson.shtml • http://en.wikipedia.org/wiki/J._J._Thomson Images: • www.makingthemodernworld.org.uk/.../IC.026/ • https://reich-chemistry.wikispaces.com/file/view/348px-Plum_pudding_atom_svg.png • http://www.welsch.com/gallery/bitmap/Rosinenkuchen_nach__Thompson_077.jpg • prl.aps.org/.../te6?height=600%3B&width=500%3B • http://nobelprize.org/nobel_prizes/physics/laureates/1906/thomson-bio.html • http://www.chemheritage.org/EducationalServices/webquest/dalton.htm • www.aip.org/history/electron/jjcrooke.htm • www.manep.ch/.../nanotubes.html

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