Assertion: atom | /r/MadeOf | a number of electrons
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Source sentences:
text: Until Rutherford’s efforts, a popular model of the atom had been the so-called “plum-pudding” model, advocated by the English physicist Joseph John Thomson, which held that each atom consists of a number of electrons (plums) embedded in a gel of positive charge (pudding); the total negative charge of the electrons exactly balances the total positive charge, yielding an atom that is electrically neutral.