Question

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

[MP PMT 1993]

• A. Greater than 0.73
• B. In between 0.73 and 0.41
• C. In between 0.41 and 0.22
• D. Less than 0.22

Answer 1

The correct option is B

In between 0.73 and 0.41

The structural arrangement of co-ordination number '6' is octahedral and its

radius ratio is . The example of octahedral is KCI and NaCl.