Answer:
It was evidence that the majority of the space in an atom is empty
Explanation:
This question comes from an experiment conducted by Ernest Rutherford and his students where they bombard a gold foil with alpha particles. As the question says, almost all the alpha particles passed straight through the foil. This was evidence that the majority of the mass of the atoms in one area of the atom with the large majority of the atom being empty and hence most of the alpha particles going through unencumbered
