If the electron of the hydrogen atom is replaced by another particle of same charge but of the double mass, then :

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speed of new particle in a shell will be lesser than the speed of electron in the same shell

radii of different shells will increase

ionization energy of the atom will be double

energy gap between two levels will become double

answer is C, D.

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Detailed Solution

$I.E. = \frac{2 π^{2} {mZ}^{2} e^{4}}{n^{2} h^{2}}, v \propto \frac{1}{m}$
when mass becomes double, the ionisation energy will be double.

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