Q. The reason for the stability of $Gd^{3 +}$ ion is
A) Half-filled $4f$ sunshell
B) Completely filled $4f$ subshell
C) Possesses the general electronic configuration of noble gases
D) Empty $4f$ subshell
Explanation
The correct answer is Option A: Half-filled $4f$ sunshell.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.