Question

30. A unit cell consists of a cube in which anions B are present at each corner and cations A at the centre of the alternate faces of the unit cell. What is the simplest formula of the compound? Also tell that how many atoms are there in alternate faces of a cube and atoms present at the centre of alternate daces of a cube with diagram.

Answer 1

Anions B are present at each corner = 8 corner atoms

Hence contribution of each anion =

$8\times \frac{1}{8}=1atom$

$CationsAarepresentatthecentreofalternatefacecentres$

$\frac{1}{2}\times 2=1atom$

$ThesimplestformulawillbeAB$