Why cant negative charges be uniformly distributed in thomson's model?
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He assumed that the electrons were uniformly distributed and free to rotate in rings inside a sphere of positive charge.
These orbits were stabilized because, when an electron moved farther from the centre of the positive cloud, it felt a larger net inward force because caused by all the positive material inside its orbit.
Others (not Thomson) compared it to a British dessert called plum pudding, so his model came to be known as the plum pudding model.
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In Thomson's model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”.
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