A) half filled \[f-\]orbitals
B) half filled \[d-\]orbitals
C) completely filled \[f-\]orbitals
D) completely filled \[d-\]orbitals
Correct Answer: B
Solution :
\[\text{F}{{\text{e}}^{\text{3+}}}\] ion has the following configuration \[\text{F}{{\text{e}}^{\text{3+}}}=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\] Hence, ferric ion is quite stable due to half-filled d-orbitals.
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