Question

The coordination number of $Al$ in the crystalline state of $AlC{l}_3$ is:

Answer 1

In the crystalline state of $AlC{l}_3$, the Cl- ions form space lattice with $A{l}^{3+}$ ions occupying octahedral voids. Hence the coordination number of Al in the crystalline state of $AlC{l}_3$ is 6.