Correct order of radius of the 1st orbit of H,He+,Li2+,Be3+ is (Bohr model is applicable):

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H>He+>Li2+>Be3+

Be3+>Li2+>He+>H

He+>Be3+>Li2+>H

He+>H>Li2+>Be3+

answer is A.

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Detailed Solution

For the given n value r ∞1Z

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