Long before the quantum model of the atom as we know today is established, scientists thought that the atom resembles a plum pudding in structure. In case the word "plum pudding" doesn't sound like something you know, think of it as a fruit/raisin cake-like dessert which is traditionally served at christmas. Just so you know, there is no "plum" nor "pudding" (as we know it) in this dish. For those of us who still have no clue, take a look at this.
J.J. Thompson, a nobel laureate, was the first to discover electrons. He thought that these negative electric charges are planted randomly into a positively charged sphere much like the raisins in a plum pudding. Perhaps it he was in a festive mood, or just simply hungry. However this discovery of the electrons was revolutionary and he later earned his nobel prize for his work. Read more about it here.
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