In AB2 crystal , A2+ ion arrange in CCP manner and B- occupy all tetrahedral voids, if radius of A2+ ion is 100 pm then the radius of B- ion (in pm) is:
22.5
41.4
20.7
73.2
As we have learnt,
Tetrahedral Voids -
Voids form by touching 4 spheres, 3 in the same plane and one in lower or upper plane is known as tetrahedral void.
wherein
r = radius of void
R = radius of atom
-