* Expected outcome: Rutherford expected alpha particles (positively charged) to pass straight through the gold foil, with only slight deflections due to the atom's assumed uniform distribution of positive charge.
* Actual outcome: Most alpha particles did pass through, but a surprising number were deflected at large angles, and some even bounced back directly.
* Conclusion: The large deflections and bounces indicated that a small, dense, positively charged region within the atom was responsible for repelling the alpha particles. This region, the nucleus, was much smaller than the atom itself, leading to the conclusion that the atom is mostly empty space.
This groundbreaking experiment revolutionized our understanding of the atom and paved the way for the development of the modern atomic model.
