Question

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

Answer 1

Answer: 6

$AlC{l}_3$ in acidified aqueous solution crystallizes as octahedral $[Al(H_{2}O{)}_6{]}^{3+}C{l}_3^{3-}$ In this complex, the $3d$ orbitals of $Al$ are involved and hybridization state of $Al$ is $s{p}^3{d}^2$ Hence, the coordination number of $Al$ is six. It exists in ccp lattice with six coordinate layer structure