The radius of which of the following orbit is same as that of the first bohr's orbit of hydrogen atom?
a) he+ (n=2)
b) li2+ (n=2)
c) li2+ (n=3)
d) be3+ (n=2)
where n=orbit

Since the n^2/Z values are same for second orbit of Be^3+ and first orbit of H, their radii are also equal. Answer is option A.

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Ithink that the answer is b