In the actual experiment a ray of alpha particles were shot at a gold foil. If the ray was replaced by electrons would the deflection increase?
The electron-electron repulsion will cause the electrons to bounce back completely without passing through the gold foil.
In the case that the momentum of the electrons provide more energy than the metal bond of the gold foil.
the foil would be penetrated like bullets through a thin wall. This could be the reason that a material like gold which is so much more heavier than any particle was used.