Answer :
Final answer:
J.J. Thomson's discoveries regarding atoms and their impact on the atomic theory.
Explanation:
J.J. Thomson made significant discoveries about atoms that changed the atomic theory. One of his key findings was the existence of the electron, a negatively charged particle within the atom. Through his experiments with cathode rays, Thomson demonstrated that atoms were not indivisible, as previously believed, but consisted of smaller, subatomic particles. This discovery led to the development of the plum pudding model, which proposed that electrons were embedded in a positively charged sphere, like plums in a pudding.
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