Chemistry | VITEEE 2014 | Discussion Page

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

A) $Fe^{2+}$

B) $Cu^{+}$

C) Zn

D) $Ni^{3+}$

Option A

$Fe^{2+}$(24)=$[Ar] 3d^{6}4s^{0}$ it has 4 unpaired electrons

$Cu^{+}$(28)=$[Ar] 3d^{10}4s^{0}$ it has 0 unpaired electron

$Zn$(30)= $[Ar] 3d^{10} 4s^{2}$ it has 0 unpaired electron

$Ni^{3+}(25)$ =[Ar]$3d^{7} 4s^{0}$ it has 3 unpaired electrons

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