Question

A compound formed by elements `A` and `B` crystallizes in cubic structure, where `A` atoms are at the corners of a cube and `B` atoms are at the face `-` centre. What is the formula of the compound ?

Answer 1

A atoms are at eight `-` corners of the cube. Therefore, the number of `A` atoms in the unit cell `=(8)/(8)=1`
`B` atoms are at the face `-` centre of six faces. Therefore, its share in the unit cell `=(6)/(2)=3`
The formula is `AB_(3)`.