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  4. The number of unpaired electrons in Fe3+ is

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Q. The number of unpaired electrons in $Fe^{3+}$ is

COMEDKCOMEDK 2009The d-and f-Block Elements

Solution:

The atomic number of $Fe$ is 26 and its electronic configuration is $[ Ar ] 4 s ^{2} 3 d ^{6}$. Thus, the electronic configuration of $Fe ^{3+}$ is $[ Ar ] 3 d ^{5}$.
Hence, it has 5 unpaired electrons in the d subshell.