The radius of the first orbit of \( \mathrm{H} \)-atom is \( \mathrm{r} \). Then, the radius of ...

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The radius of the first orbit of \( \mathrm{H} \)-atom is \( \mathrm{r} \). Then, the radius of the first orbit of \( \mathrm{Li}^{2+} \) will be:
(a) \( \mathrm{r} / 9 \)
(b) \( \mathrm{r} / 3 \)
(c) \( 3 \mathrm{r} \)
(d) \( 9 \mathrm{r} \)
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