How did the Alpha Scattering Experiment disprove the Plum Pudding Model?

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Bertybassett
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Also, did the plum pudding state that all the electrons located around it had the same charge as the 'positive' region but opposite?
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rickH123
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Well the Alpha Experiement showed that there was matter in the centre of the atom. Also it showed that the matter is positively charged, because some rays were deflected by 4 degrees. This is because alpha particles are positive, and it being deflected meant that there is positive matter in the centre. Whereas if it was the old plum pudding model, it would have been a different result.
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Bertybassett
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What would the different result have been if it had been the plum pudding model?

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safa_k
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(Original post by Bertybassett)
What would the different result have been if it had been the plum pudding model?

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well, the plum pudding model was essentially a positively charged sphere with electrons embedded in it, thus you could say its neutral. so if an alpha particle, with a positive charge, went through this it wouldn't be deflected????? I think???? what rutherford's experiment really showed was the evidence of the nucleus and its size.
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A.J.Rimmer
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(Original post by Bertybassett)
Also, did the plum pudding state that all the electrons located around it had the same charge as the 'positive' region but opposite?
The Plum Pudding model is: a sphere of positive charge, punctuated with negatively charged electrons (like a plum pudding). The charge of the positive sphere would equal the same as the electrons, but reversed, like you said, because they knew atoms were neutral.

The Alpha Scattering Experiment had three outcomes, and they proved different things:
1) Most of the particles passed through the foil in a straight line. Therefore, most of the atom must be empty space.
2) Some particles were deflected back towards the source. Therefore, the atom must have a nucleus. This nucleus must be massive (i.e. heavy (not necessarily large)), as alpha particles bounce off it. However, as point 1 says, most of the atom is empty, so the nucleus must be very small, and so therefore it is very dense.
3) Some particles went off at weird angles after passing through the foil. Therefore, the nucleus has a positive charge as the electromagnetic force must be what pushes the (positively charged) alpha particles off course.

In conclusion, an atom is:
-Mainly empty space and the centre is a small, dense nucleus with a positive charge.

This does not fit the plum pudding model (e.g. the 'sphere of positive charge' is not the same as 'empty space'), so therefore the evidence disproves it.
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