* Rutherford's Gold Foil Experiment: Rutherford is best known for his famous gold foil experiment in 1911. He bombarded a thin sheet of gold foil with alpha particles (positively charged). The results showed that:
* Most particles passed straight through the foil.
* A small number deflected at large angles.
* A very few bounced back.
* Rutherford's Model: These results led Rutherford to propose a model of the atom where:
* A small, dense, positively charged nucleus was at the center.
* Electrons orbited the nucleus like planets orbit the Sun.
The "mini solar system" model actually came later, and it was proposed by Niels Bohr.
* Bohr's Model: Bohr took Rutherford's model and added quantum ideas to explain why electrons didn't spiral into the nucleus. He proposed that electrons orbit in specific energy levels (like orbits around the Sun) and that they can jump between these levels by absorbing or emitting energy.
So, while Rutherford's work laid the foundation for the modern atom, Bohr's model is the one that resembles a miniature solar system.
