Neutrons plum pudding" model

Joseph John Thomson had supposed that an atom was a uniform sphere of positively charged matter within which electrons were circulating (the plum-pudding model). Then, around the year 1910, Ernest Ruthorford (who had discovered earlier that alpha rays consisted of positively charged particles having the mass of helium atoms) was led to the following model for the atom Protons and neutrons exist in a very small nucleus, which means that the tiny nucleus contains all the positive charge and most of the... 

Solar system model—c Nuclear atom—e Original atomic theory—b Quantum mechanical model—a Plum pudding model—d Neutron—g... 

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