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 Y are present at the 8 corners of the cube, therefore, number of atoms of Y in the unit cell `=1//8 xx8=1 `
As atoms X are present at the body centure, therefore, number of atoms of X in the unit cell = 1
Ratio of atoms X : Y = 1 : 1. Hence, the formula of the compound is XY