Answer to Question #212444 in General Chemistry for Saiara

Question #212444

If plum pudding model of atom would be valid, then producing cathode ray and electricity would be a myth”- justify these statement with scientific facts

Expert's answer
  • the fact that most alpha particles went straight through the foil is evidence for the atom being mostly empty space
  • a small number of alpha particles being deflected at large angles suggested that there is a concentration of positive charge in the atom - like charges repel, so the positive alpha particles were being repelled by positive charges
  • the very small number of alpha particles coming straight back suggested that the positive charge and mass are concentrated in a tiny volume in the atom (the nucleus) - the tiny number doing this means the chance of being on that exact collision course was very small, and so the 'target' being aimed at had to be equally 

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