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  4. Which of the following has the maximum number of unpaired d - electrons ?

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Q. Which of the following has the maximum number of unpaired $d$ - electrons ?

AIPMTAIPMT 1999The d-and f-Block Elements

Solution:

$Fe ^{2+}$ has maximum unpaired d electrons of $4 . Zn ^{2+}$ has no unpaired electrons.. $Ni ^{2+}$ has E2$ unpaired electron and $Cu ^{2+}$ has two electrons.