A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q?
Given. Atoms of Q are the corners of the cube and P at the body- centre
Therefore, Number of atoms of Q in one unit cell 
Number of atoms of P in one unit cell =1
Therefore, Ratio of P and Q atoms = P:Q = 1:1
Therefore, formula of the given compound = PQ
Since it is bcc
Therefore, coordinate number of P and Q = 8
14