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  4. For Cu +, effective nuclear charge felt by a 3 d- electron is

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Q. For $Cu ^{+}$, effective nuclear charge felt by a $3 d-$ electron is

Classification of Elements and Periodicity in Properties

Solution:

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(One $d$-electron is screened by $17$ electrons in $n$ th, $8$ electrons in $(n-1)$ and $2$ electrons in $(n-2)$
$Z_{ eff }=29-14.75=14.25$