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Why is Thomson's model of an atom electrostatically unstable?

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The plum pudding model of J. J. Thomson stated that the positive charge is distributed like a plum and negative charges are embedded in it. read more

The centre consisted of a dense positively charged nuclei and the negative charge was present outside this nucleus. This lead to the failure of J.J. Thomson's model of the atom. Now coming to the part of why it was electristatically unstable. The positively charged cloud Thomson's model is based on is uniform in density. read more

The most important purpose lies in it’s predicted scattering pattern for a beam of energetic alpha particles fired at the atom. The alpha particles are frequently deviated but just by a small acute angle - never back scattered. read more

Thomson proposed that the shape of an atom resembles that of a sphere having a radius of the order of 10-10 m. The positively charged particles are uniformly distributed with electrons arranged in such a manner that the atom is electrostatically stable. Thomson’s atomic model was also called as the plum pudding model or the watermelon model. read more

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