Question

Among the following the most stable ion is:

• A. $F{e}^{2+}$
• B. $S{c}^{4+}$
• C. $M{n}^{3+}$
• D. $M{n}^{2+}$

Answer 1

Answer: (D)

$F{e}^{2+}\to 3d^6,S{c}^{4+}\to 3p^5,M{n}^{3+}\to 3d^4$

$M{n}^{2+}\to 3d^5$ (Exactly half-filled hence stable)