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