The plum pudding model is an early 20th-century atomic model proposed by physicist J.J. Thomson. After his discovery of the electron in 1897, Thomson suggested that atoms consist of a uniform distribution of positively charged "pudding" with negatively charged electrons (the "plums") embedded within it. In this model, the positive charge was thought to be spread out throughout the atom, similar to how raisins are distributed in a pudding.
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