\( Z_{\text {eff }} \) of 4 s electron in \( \mathrm{Zn} \) is- P (...

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\( Z_{\text {eff }} \) of 4 s electron in \( \mathrm{Zn} \) is-
P
(1) 11.25
(2) 18.75
W
(3) 25.65
(4) 4.35
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