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 ?

Explanation

As atoms Q are present at the 8 corners of the cube, therefore, number of atoms of Q in the unit cell = `8 xx 1/8 = 1`
As atoms P are present at the body centre, therefore, number of atoms P in the unit cell = 1
`:.` Formula of the compound = PQ
Coordination number of each P and Q = 8 .