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The $Z_{effective}$ of $3^{rd}$ period element according to Slater's rule is : (where n is the number of outermost shell electron)

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$1.55 + 0.35 n$

$1.45 + 0.30 n$

$1.55 + 0.65 n$

$1.35 + 0.65 n$

answer is A.

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Detailed Solution

$S = (n - 1) \times 0.35 + 8 \times 0.85 + 2 \times 1.00$

$= 8.45 + 0.35 n .$

$z_{e f f} = (10 + n) - (8.45 + 0.35 n)$

$= 1.55 + 0.65 n$

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