Here's why:
* Gold Foil Experiment: Rutherford's famous experiment involved firing alpha particles (positively charged) at a thin gold foil.
* Expected Outcome: Based on the prevailing "plum pudding" model of the atom (where positive charge was spread throughout), Rutherford expected the alpha particles to pass straight through the foil with minimal deflection.
* Actual Outcome: To his surprise, a small percentage of the alpha particles were deflected at large angles, and some even bounced back.
* Conclusion: The only way to explain this was if the positive charge of the atom was concentrated in a tiny, dense nucleus at the center, surrounded by a vast, mostly empty space where electrons orbit.
This discovery revolutionized our understanding of atomic structure and led to the development of the nuclear model of the atom.
