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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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1.06 A

0.53 A

0.26 A

2.12 A

answer is D.

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Detailed Solution

$r_{He +} = \frac{0 .53 \times 2^{2}}{2} = 1 .06 A^{o}$

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