JJ Thompsons discovery of the electron lead him to develop a basic model of the atom called the plum pudding model. Ernest Rutherford and with the work of geiger and Marsden, develop the experiment to test this model, the results of which radically changed our understanding of the structure of the atom.
The two Interactive
Using this interactive, we will examine the two opposing models
Using this interactive, we will examine the two opposing models
- First choose the plum pudding model
You can see how the alpha particel are MEANT to behave.
Of course, that was not was observed in the gold foi experiment - Now examine the Rutherford model
Here you see the results of. the scattering. Click the nucleus to see that alpha particles do strike the nucleus but are repelled by it
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Extra
In this video, using a 3D printed model I demonstrate how the scattering experiment works giving you the viewer to participate. I also then discuss how science relies on the development of models that explain observations and are able to therefore predict outcomes If you wish tp print out your own version of this model you can find it here. It was designed by ScoolLab , based at CERN |
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It is important to note, that although this model was successful in providing an explanation for the gold foil experiment, it does not mean that this model is accurate.
As mentioned in the video fails to explain why the electrons don't spiral in due to loss of energy, as predicted by Maxwell.
The solution came in the form of a quantum solution , which we address in later lesson, Bohr's model.
The next lesson looks at the discovery of the neutron.
As mentioned in the video fails to explain why the electrons don't spiral in due to loss of energy, as predicted by Maxwell.
The solution came in the form of a quantum solution , which we address in later lesson, Bohr's model.
The next lesson looks at the discovery of the neutron.
