Choose the correct alternative from the clues given at the end of each statement:
$(a)$ The size of the atom in Thomson's model is .......... the atomic size in Rutherford's model. (much greater than/no different from/much less than.)
$(b)$ In the ground state of .......... electrons are in stable equilibrium,while in .......... electrons always experience a net force. (Thomson's model/Rutherford's model.)
$(c)$ $A$ classical atom based on .......... is doomed to collapse. (Thomson's model/Rutherford's model.)
$(d)$ An atom has a nearly continuous mass distribution in a .......... but has a highly non-uniform mass distribution in .......... (Thomson's model/Rutherford's model.)
$(e)$ The positively charged part of the atom possesses most of the mass in .......... (Rutherford's model/both the models.)

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(A) The sizes of the atoms in Thomson's model and Rutherford's model are of the same order of magnitude,so the correct choice is 'no different from'.
$(b)$ In the ground state of Thomson's model,the electrons are in stable equilibrium. In Rutherford's model,the electrons are in motion and always experience a net force.
$(c)$ $A$ classical atom based on Rutherford's model is doomed to collapse because the revolving electrons would continuously radiate energy and spiral into the nucleus.
$(d)$ An atom has a nearly continuous mass distribution in Thomson's model (the plum pudding model),but has a highly non-uniform mass distribution in Rutherford's model (concentrated in the nucleus).
$(e)$ The positively charged part of the atom possesses most of the mass in both the models.

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