A cubic solid is made of two elements and Atoms of are at the corners of the cube and at the body-centre. What is the formula of the compound? What are the coordination numbers of and

Ans: It is given that the atoms of are present at the corners of the cube. Therefore, number of atoms of in one unit cell
It is also given that the atoms of are present at the body-centre.
Therefore, number of atoms of in one unit cell
This means that the ratio of the number of atoms to the number of atoms,
Hence, the formula of the compound is
The coordination number of both and is 8 .