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The radius of the first orbit of hydrogen is 0.53 A. The radius of second orbit of He⁺ would be:

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0.53 A°

0.26 A°

2.12 A°

1.06 A°

answer is D.

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Detailed Solution

$r_{{He}^{+}} = \frac{0.53 \times 2^{2}}{2} = 1.06 A^{0}$

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