Abstract: Based on the electronic structure and chemical bonding properties of the skeleton-ligand bonds of the skeleton of a cluster compound, having determined the number of empty valence orbitals or lone pair electronic orbitals of the cluster, the number of total bond valence of the skeleton is obtained according to the distribution of the number of valence electrons of the skeleton in valence bonding orbitals of the skeleton, then the chemical bonding properties between neighbouring two atoms in the skeleton can be guessed with the configuration of the skeleton of the cluster compound.

Key words: Cluster compound, Electron configuration, Bond valence