Question

A cube solid is made up 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 ?

Answer 1

Contribution of atoms Q present at 8 corners of the cube

$=\frac{1}{8}\times 8=1$

Contribution of atoms P present at the body centre = 1

Therefore, ratio of P and Q = 1 : 1 so, the formula is PQ.

Coordination number of atoms P and Q = 8.