Question

What is the coordination number of $C{l}^{-}$ in $CsCl$ structure?

Answer 1

The caesium chloride structure adopts a primitive cubic lattice. Here, stoichiometric ratio of ${Cs}^{+}$ to ${Cl}^{-}$ is $1:1$. Now, each ${Cl}^{-}$ is connected to $8$ ${Cs}^{+}$ atoms. Hence, the co-ordination number is $8$.