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The Plum Pudding or Raisin Bun Model

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Presentation on theme: "The Plum Pudding or Raisin Bun Model"— Presentation transcript:

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

2 one indivisible sphere.
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 retrieved June 15, 2009 Images: prl.aps.org/.../te6?height=600%3B&width=500%3B

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