A cubic solid is made of two element `P` and `Q` Atoms of `Q` are the corners of the cube `P` at the body-centre. What is the formula of the compound? What are the coordination number fo `P` and `Q`?

Explanation

As atoms Q are present at the eight corners of the cube, therefore, the contribution of atoms of Q in the unit cell `=1//8xx8=1`
As atom P is present at the body centre, therefore, the contricbution of atoms of P in the unit cell=1
`therefore` Ratio of atoms of P:Q=1:1
Hence, the formula of the compound=PQ The coordination number of each P and Q=8