Question

Which of the following is most stable among $C{u}^{+},F{e}^{+},F{e}^{2+}$ and $F{e}^{3+}$ ?

• A. $C{u}^{+}$
• B. $F{e}^{+}$
• C. $F{e}^{2+}$
• D. $F{e}^{3+}$

Answer 1

Answer: (D)

$F{e}^{3+}$ electronic configuration $3s^{2}3p^{6}3d^5,$ has half-filled d-orbital is more stable than $C{u}^{+},F{e}^{+}$ arid q $F{e}^{2+}$ . $C{u}^{+}$ electronic configuration $3s^{2}3p^{6}3d^{10}$ although having fully-filled 3rd shell is less stable because nuclear charge (29 protons) on $Cu$ is not sufficient enough to hold 28 electrons.