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To put this as straight forward as possible, Rutherford came up with the nuclear model of the atom, before that, no one knew that the nucleus even existed, people use to think that most of the atom was made up of positive charge overall, with some negative (electrons) charge on the top of it, this theory was called the Plum pudding.

Niels Bohr modified the atom structure even more, he realized that electrons in a cloud around the nucleus of an atom, as Rutherford described would quickly spiral down into the nucleus, causing the atom to collapse. So Bohr proposed a new model of the atom with basic principals: -Electrons only exist in fixed orbitals (shells) and not anywhere in between. -Each shell has a fixed energy In summary: Rutherford explained the nucleus of an atom, while Bohr was more into the electrons and their energy levels .

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