Question

For an ionic crystal of the general formula $AX$ and coordination number $6$, the value of radius ratio will be

• A. in between 0.732 and 0.414
• B. in between 0.414 and 0.225
• C. less than 0.225
• D. greater than 0.732

Answer 1

Answer: (A)

in between 0.732 and 0.414

Answer 2

The structural arrangement of coordination number $6$ is octahedral and its radius ratio is $0.414 - 0.732$. The example of octahedral is $KCl$ and $NaCl$.