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  4. The number of unpaired electrons in Fe3+(Z = 26) are

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Q. The number of unpaired electrons in $Fe^{3+}(Z = 26)$ are

KCETKCET 2000The d-and f-Block Elements

Solution:

Fe(Z = 26): $[ Ar]^{18} \, 4s^2 \, 3d^6$
$ Fe^{3+} : [Ar]^{18} \, 3d^5 $
Number of unpaired electrons = 5.