If an atom were scaled up to the size of a sports arena, the space filled by the positive charges inside the atom (according to the work of ernest Rutherford early in this century) would be very small (perhaps size of the soccer ball).
A classical atoms based on Rutherford's model is doomed to collapse. An atom has highly non-uniform mass distribution in Rutherford's model.The positively charges part of the atom possess most of the mass in Rutherford's model. The positive charge and most of the mass of the atom were densely concentrated in extremely small region . This small region is called nucleus according Rutherford's model.
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