# Select the correct statements:-$\begin{array}{1 1}(A)\;\text{ For CsCl unit cell (edge-length = a), }r_c + r_a =\large\frac{\sqrt 3a}{2}\\(B)\;\text{ For NaCl unit cell (edge-length = l), }r_c + r_a =\large\frac{1}{2}\\(C)\;\text{ The void space in a b.c.c unit cell is 0.68}\\(D)\;\text{The void space % in a face-centered unit cell is 26%}\end{array}$

## 1 Answer

All of these
Hence (D) is the correct answer.
answered May 30, 2014