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Find the radius of the orbit corresponding to the 4th excited state in Li^++. (a0 is the radius of first orbit in H-atom)

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Find the radius of the orbit corresponding to the 4th excited state in Li++. (a0 is the radius of first orbit in H-atom)

(1) 25/3 a0

(2) 16/3 a0

(3) 25a0

(4) 12a0

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Correct option is (1) 25/3 a0

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