Radius of \( 2^{\text {nd }} \) orbit of \( \mathrm{He}^{+}=\mathrm{x} \) calculate radius for \...

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Radius of \( 2^{\text {nd }} \) orbit of \( \mathrm{He}^{+}=\mathrm{x} \) calculate radius for \( 3^{\text {rd }} \) orbit of \( \mathrm{Be}^{+3} \)
(1) \( 9 \mathrm{x} / 8 \)
(2) \( 27 x / 8 \)
(3) \( 8 x / 9 \)
(4) \( 8 x / 27 \)
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