CsCl has bcc structure with `Cs^(+)` at the centre and `Cl^(-)` ion at each corner. If `r_(Cs^(+))` is `1.69Å` and `r_(Cl^(-))` is `1.81Å` what is the edge length of the cube?

Options

A. 3.5 Å
B. 3.80 Å
C. 4.04 Å
D. 4.5 Å

Answer

C

Explanation

`sqrt(3)a=2(r^(+)+r^(-))`
`impliesa=(2xx(1.69+1.81))/(1.732)`
`impliesa=4.04Å`