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Calculate the $Z_{eff}$ (approx) for $4 s$ electron of Ni-atom according to Slater's rule.

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Detailed Solution

$Ni \to 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{8} 4 s^{2}$
$σ = 10 \times 1 + 16 \times 0.85 + 1 \times 0.35 = 23.95$
$Z_{eff} = Z - σ$ $= 28 - 23.95 = 4.05 ≃ 4$

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