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JEE PHYSICS MCQ: ATOMS

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Which energy state of the triply ionized beryllium has the same electron orbital radius as that of ground state of hydrogen? Given ZZ for Be = 4\mathrm{Be}\,\mathrm{ = }\,\mathrm{4}
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Correct option: D
n=1n = 1
Option C (n=2n = 2) is correct because the electron orbital radius is proportional to n2/Zn^2/Z, and for the radii to be equal, n2/Zn^2/Z must be the same for both hydrogen and triply ionized beryllium.

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