Ernest Rutherford was interested in knowing how the electrons are arranged within an atom. Therefore he designed an experiment for this. In this experiment, fast moving alpha (α)-particles were made to fall on a thin gold foil.
Three major observations that he made are as follows:
1. Most of the fast moving α-particles passed straight through the gold foil. The figure below shows the same.
2. Some of the α-particles were deflected by the foil by small angles. The figure below shows the same.
3. Surprisingly one out of every 12,000 alpha particles appeared to rebound. The figure below shows the same.
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