The number of elements in the transition metal series through $Zn$ that have four unpaired electrons in their $+2$ state are:
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$Fe^{2 }+ (z = 26) = [Ar] 3d^6$
$Cr^{2 }+ (z = 24) = [Ar] 3d^4$
$Cr^{2 }+ (z = 24) = [Ar] 3d^4$
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