the plum pudding model of the atom was that electrons (negatively charged) were stuck in a mass of positive charged stuff . we know it is wrong , but here is how someone proved it wrong . Ernest Rutherford was doing a experiment in which he took gold foil and something that flashes when it is hit by Alpha particles.
then he and his team took that something that flashes when hit bye Alpha particles and bend it into a circle. Then he put the golden foil in the middle of the circle taking an Alpha gun, he shot Alpha particles at the gold foil.
What he saw was that most of the time the particles went through the gold foil. This made him think that the atom was mostly empty space.
But sometimes the alpha particles bounced off the foil at different angles or came back. This made him think that there was something in the middle of the atom that was hard enough to make the particles bounce back and that it might be positive charged.(we know that this is the nucleus) That is how he proved the plum pudding model wrong .
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