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  4. If R is the radius of the octahedral voids and r is the radius of the atom in close packing, then r / R is equal to

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Q. If $R$ is the radius of the octahedral voids and $r$ is the radius of the atom in close packing, then $r / R$ is equal to

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Solution:

For OV,
$\frac{R}{r}\left(\text { i. e. } \frac{r_{\oplus}}{r_{\ominus}} \text { or } \frac{r_{\text {void }}}{r_{\Theta}}\right)=0.414$
$\therefore \frac{r}{R}=\frac{1}{0.414}=2.41$