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

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By Expert Faculty of Sri Chaitanya
a
H>He+>Li2+>Be3+
b
Be3+>Li2+>He+>H
c
He+>Be3+>Li2+>H
d
He+>H>Li2+>Be3+

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detailed solution

Correct option is A

For the given n value r ∞1Z


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