The As ¬ As bond length in elemental arsenic is 2.48 Å. The Cl ¬ Cl bond length in Cl2 is 1.99 Å. (a) Based on these data, what is the predicted As ¬ Cl bond length in arsenic trichlo- ride, AsCl₃, in which each of the three Cl atoms is bonded to the As atom?

Bond length is the average distance between the nuclei of two bonded atoms. It is influenced by factors such as atomic size, bond order, and the presence of lone pairs. In general, shorter bond lengths indicate stronger bonds due to greater overlap of atomic orbitals.

Hybridization is the concept of mixing atomic orbitals to form new hybrid orbitals that can accommodate bonding. In the case of arsenic trichloride (AsCl3), arsenic undergoes sp3 hybridization, resulting in four equivalent hybrid orbitals that form sigma bonds with the three chlorine atoms and one lone pair.

Trends in bond lengths can be predicted based on the types of atoms involved and their bonding characteristics. Generally, bond lengths increase with the size of the atoms and decrease with increasing bond order. By comparing known bond lengths, one can estimate the bond length in new compounds, such as AsCl3, by considering the influence of both As-As and Cl-Cl bonds.