Question

Why do most of the alpha particles pass straight through the gold foil?

Answer 1

Hey!!

because some rays pass away through the nucleus of those atoms

Answer 2

Because there's lots of space between atoms in the foil. So the alphas just slid through in between them for the most part. But not all of them. There was some scattering, which showed that some of the alphas were hitting and rebounding off something solid.