Question

Define the plum pudding model

Answer 1

The plum pudding model was an early (and incorrect) 20th century model of an atom. It was proposed by J.J. Thomson in 1904,after the discovery of the electron, but before the discovery of the atomic nucleus. During that time, scientists knew that there was a positive charge in the atom that balanced out the negative charges of the electrons, making the atom neutral, but they didn't know where the positive charge was coming from. Thomson's model showed an atom that had a positively charged medium, or space, with negatively charged electrons inside the medium. Soon after its proposal, the model was called a 'plum pudding' model because the positive medium was like a pudding, with electrons, or plums, inside.

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