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  4. The ratio of anion radius to cation radius of a crystal is 10: 9.3. Then, the coordination number of the cation in the crystal is

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Q. The ratio of anion radius to cation radius of a crystal is $10: 9.3$. Then, the coordination number of the cation in the crystal is

EAMCETEAMCET 2010

Solution:

Given, the radius ratio of anion to cation
$=10: 9.3$
$\therefore $ 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.