In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) and fluoride ion (F-) are
(a) 4 and 2 (b) 6 and 6
(c) 8 and 4 (d) 4 and 8
Concept Videos :-
Concept Questions :-
(a) In CaF2 (Fluorite structure), Ca2+ ions are arranged in ccp arrangement (Ca2+ ions are present at all corners and at the centre of each face of the cube) while F- ions occupy all the tetrahedral sites.
From the above figure, you can clearly see that coordination number of F- is 4 while that of Ca2+ is 8.