Question

CsBr crystal has bcc structure . It has an edge length of `4.3 overset(@)A`. The shortest interionic distance between `Cs^(+)` and `Br^(-)` ions is
A. `1.86 overset(@)A`
B. `3.72 overset(@)A`
C. `4.3 overset(@)A`
D. `7.44 overset(@)A`

Answer 1

Correct Answer - B
Closest approach in bcc lattice
`=(1)/(2)` of body diagonal `=(1)/(2)xxsqrt(3)a =sqrt(3)/(2)xx4.3=3.72overset(@)A`.