Question

A cubic solid is made up of two elements $P$ and $Q$. Atoms of $Q$ are present at the corners of the cube and atoms of $P$ at the body center. The coordination number of $P$ and $Q$ will be:

Answer 1

$Z_{effective}$ of $P=1$

$Z_{effective}$ of $Q=\frac{1}{8}\times 8=1$

$P$ is surrounded by $8Q$ atoms and $Q$ is surrounded by $8P$ atoms

So, coordination number of both $P$ & $Q$ is $8$