Q. Which one of the following elements is unable to form $MF_6^{3-}$ ion ?
A) B
B) Al
C) Ga
D) In
Explanation
[Solution] Boron has no d orbitals, so its maximum covalency is 4; it cannot form $BF_6^{3-}$. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.