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Q.

The radius of 4th shell in Li⁺² is

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a

0.846 $\overset{o}{A}$

b

1.68 $\overset{o}{A}$

c

2.82 $\overset{o}{A}$

d

0.282 $\overset{o}{A}$

answer is A.

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Detailed Solution

$r_{n} = \frac{n^{2}}{Z} r_{0} . . . . where r_{0} = 0.529 A^{0}; r_{4} ({Li}^{2 +}) = \frac{4^{2}}{3} (0.529 A^{0});$

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The radius of 4th shell in Li+2 is