Why was the plum pudding model for atoms doubted?

Thomson's raisin bun model of the atom, where electrons are embedded in a blob of massless positive charge, was invalidated by the gold foil experiment (http://en.wikipedia.org/wiki/Geiger-Marsden_experiment). Alpha particles (i.e. , helium nuclei: two protons and two neutrons) fired at gold foil were expected to pass through unobstructed under Thomson's model, but occasionally deflected back at an extremely sharp angle -- some essentially doubled back at a 180 degree angle.

This suggested that the positive charge of the gold foil's atoms was concentrated in a tiny mass at the centre of the atom, producing a large repulsive electric force on the (rare) occasions that the positively-charged alpha particles closely approached the proton-containing nuclei of the foil's atoms. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.