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Option in which shielding constant (According to Slater's rule) is 0.85 by each electron in all inner shell(s):

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for outer most electron of Li

for outer most electron of Na

both (a) and (b)

none of the above

answer is A.

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Detailed Solution

$Li \to (1 s^{2}) (2 s^{1})$ ${Li}_{3} \to 1 s^{2}, 2 s^{1}$

$σ = 0.85 \times 2 = 1.7$

$N a_{11} \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s \overset{I}{1} \overset{I}{0.05}$

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