Question

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

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

Answer 1

The correct option is D 4 f sub shell- half filled

Gd= $4f^{7}5d^{1}6s^2;G{d}^{3+}=4f^7$