Question

The reason for the stability of $G{d}^{3+}$ ion is

• A. half-filled 4f-subshell
• B. completely filled 4f-subshell
• C. possesses the general electronic configuration of noble gases
• D. empty 4f-subshell

Answer 1

Answer: (A)

$Gd(Z=64)\to [Xe]4f^{7}5d^{1}6s^2$
$\therefore G{d}^{3+}\to [Xe]4f^7$
$G{d}^{3+}$ is highly stable due to stable half-filled configuration.