Q. In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion ($Ca^{2+}$) and fluoride ion ($F^-$) are
A) 4 and 2
B) 6 and 6
C) 8 and 4
D) 4 and 8
Explanation
[Solution] In fluorite, each $Ca^{2+}$ is surrounded by 8 $F^-$ and each $F^-$ by 4 $Ca^{2+}$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.