Question

If the radius ratio is between 0.225 - 0.414, what will be the type of void present. What will be the coordination number?

• A. linear
• B. tetrahedral - 4
• C. tetrahedral - 2
• D. octahedral

Answer 1

The correct option is B

tetrahedral - 4

If the radius ratio is between 0.225 and 0.414, it will have a tetrahedral void. The derivation of this actually takes place in reverse where we assume a tetrahedral void and arrive at the value, but the converse also holds true. A tetrahedral void naturally means there are 4 surrounding atoms. So, coordination number will be 4.