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The radius of the 2^nd orbit of Li^2+ is x. The expected radius of the 3^rd orbit of Be^3+ is

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The radius of the 2nd orbit of Li2+ is x. The expected radius of the 3rd orbit of Be3+ is

(1) 9/4 x

(2) 4/9 x

(3) 27/16 x

(4) 16/27 x

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Correct option is (3) 27/16 x

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