A) 108 pm
B) 128 pm
C) 157 pm
D) 181 pm
Correct Answer: B
Solution :
\[fcc\]lattice |
\[a=361\,\operatorname{pm}\] |
\[\operatorname{a}\sqrt{2}=4r\] |
\[\operatorname{r}=\frac{361\times \sqrt{2}}{4}=127.6\approx 128pm\] |
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