Question

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

• A. $2.41$
• B. $4.76$
• C. $3.22$
• D. $9.1$

Answer 1

Answer: (A)

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