A cubic solid is made up iof two elements X and Y . Atoms Y are present at the corners of the cube and atoms X at the body centre. What is the formula of the compound ? What are the coordination number of X and Y ?

Explanation

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