The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is

The radius ratio is given by- r r It is given in the question that r r >0.732 from which we can predict that it has b.c.c type lattice. Hence, the coordination number is 8. Thus, the correct option is (b).8 Packing in solids (fcc, bcc and hcp lattices)