Three elements PQR crystallise in a cubic type lattice with P atoms at the corner Q atoms at the cubic centre and R atoms at the edge centre. Calculate the formula of the compound.

A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the corners of the cube and B atoms at the centre of the cube. What is the formula of the compound?

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 numbes of P and Q?

In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms are at the face centres. One of the A atom is missing from one corner in the unit cell. What will be the result our formula of the compound formed?