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Rutherford's alpha particle scattering experiment involved placing a thin gold foil within a vacuum, then aiming a beam of alpha particles (helium nuclei) at it. Detectors placed around the gold foil would measure angles of deflection for these particles. With these observations, Rutherford explored the structure of atoms.

Most alpha particles were not appreciably deflected as they passed through the gold foil. This indicates that the majority of the gold atoms' internal spaces are empty, allowing the alpha particles to pass through with minimal interaction. Rutherford concluded that the atoms must have a large empty space, with the majority of the mass concentrated in a small central region called the nucleus.

A small number of alpha particles were deflected at very large angles or even turned back, instead of passing through the gold foil. This can be explained by the repulsive forces experienced by the positively charged alpha particles when they come close to the positively charged nucleus of the gold atoms. The large deflections indicate that the nucleus contains a high positive charge and is small compared to the size of the atom.

If beryllium foil were used instead of gold foil in the alpha particle scattering experiment, there would be some differences observed in the results. Firstly, as beryllium has a smaller nucleus (4 protons) than gold (79 protons), the positive charge in the nucleus would be smaller. There might be fewer alpha particles deflected at very large angles, as they are less likely to experience strong repulsive forces coming close to the smaller nucleus. Moreover, the overall thickness of the beryllium foil layer might influence how alpha particles pass through, either by requiring a thinner layer or by having more alpha particles travel through it without significant deflection. This can play a role in determining the scattering pattern observed. In conclusion, the differences in atomic structure and size of beryllium compared to gold would result in a slightly different scattering pattern for the alpha particles. Overall, however, Rutherford's conclusion about the presence of a relatively small, positively charged nucleus within a large empty space would still hold true.