(Solved): 2. What did Ernest Rutherford conclude about atomic structure from his experiments with \( \alpha ...

2. What did Ernest Rutherford conclude about atomic structure from his experiments with \( \alpha \)-particles and thin metal foils? 3. a) Calculate the number of protons, neutrons and electrons in the ion \( \mathrm{Al}^{3+} \), weighing 29 amu. b) Display your answer to \( 3( \) a) as a conventional isotope symbol.