A cubic solid is made up of 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 numbers of X and Y ?

A cubic solid is made up of two elements X and Y. Atoms Y are present

1.	A cubic solid is made up of 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 numbers of X and Y ?
Answer» Solution :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