A) 190.70 pm
B) 225 pm
C) 127.5pm
D) None of these
Correct Answer: A
Solution :
For BCC lattice, \[\sqrt{3}a=2({{r}^{+}}+{{r}^{-}})\] \[\Rightarrow \]\[{{r}^{+}}+{{r}^{-}}=\frac{\sqrt{3}}{2}a\] \[\Rightarrow \]\[{{r}^{+}}+{{r}^{-}}=\frac{\sqrt{3}}{2}\times 480\] \[\Rightarrow \]\[{{r}^{+}}=\frac{\sqrt{3}}{2}\times 480-{{r}^{-}}\] \[\Rightarrow \]\[{{r}^{+}}=415.68-225\] \[\Rightarrow \]\[{{r}^{+}}=190.68\,pm\]
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