EAMCET Engineering 2010 Solved Paper

Given, the radius ratio of anion to cation
=10:9.3
∴ The radius ratio of cation to anion
‌=9.3:10
‌=0.93
When the cation to anion ratio lie between 0.732 to 1.00 , the coordination number is 8 . Thus, the coordination number of the cation in the crystal is 8 .