Nuclear Structure

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The document discusses J.J. Thomson's model of the atom from 1904 and Ernest Rutherford's alpha particle scattering experiment which showed most alpha particles passed through the gold foil with slight deflection but some were deflected at large angles, contrary to Thomson's model. This led Rutherford to propose in 1911 a new nuclear model of the atom where a very small, dense positively charged nucleus is surrounded by orbiting electrons.

Rutherford’s alpha particle scattering experiment beam of alpha particles fluorescent screen deflected alpha particles gold foil

Nuclear Structure

1. Thompson model of the atom: 1904

2. Rutherford’s alpha particle scattering experiment beam of alpha particles fluorescent screen deflected alpha particles gold foil

3. predicted results

4. Rutherford’s experimental results

5. repulsion of like charges

6. elastic collisions

7. Rutherford’s model of the atom: 1911

8. analysis

Editor's Notes

#4: This slide shows a limited angular deflection of the alpha particles. The scattering is not random & careful observation over a long period may detect this.
#5: The angular deflection of the alpha particles is much larger & some ( although not 1 in 8000) will be deflected through angles more than 90 degrees. The scattering is random.
#6: The ‘alpha source’ is ‘drag and drop’

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Nuclear Structure

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Editor's Notes