A solid AB has NaCl type structure for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces. The edge length is 580.4 pm and radius of cation is 100 pm them find out the radius of anion.

Options

A. The radius `r^(+)//r^(-)` increases as coordination number increases
B. As the difference in size of ions increases, coordination number increases
C. When coordination number is eight, the `r^(+)//r^(-)` ratio lies between 0.225 to 0.414
D. In ionic solid of the type AX(ZnS, Wurtzite) the coordination number of `Zn^(2+)` and `S^(2-)` respectively are 4 and 4.

Answer

C

Explanation

When coordination number is eight, the radius ratio `r^(+)/r^(-)` lies between 0.732 to 1.000.