Metal-Metal Bonds in Chains of Three or More Metal Atoms: From Homometallic to Heterometallic Chains.- Electronically Coupled MM Quadruple Bonded Complexes of Molybdenum and Tungsten.- Transition Metal Complexes Stabilized by Bulky Terphenyl Ligands: Application to Metal-Metal Bonded Compounds.- Metal-Metal Bonding in Bridging Hydride and Alkyl Compounds.- Structure and Bonding of Metal-Rich Coordination Compounds Containing Low Valent Ga(I) and Zn(I) Ligands.- Homocatenation of Metal and Metalloid Main Group Elements.- Aromaticity/Antiaromaticity in "Bare" and "Ligand-Stabilized" Rings of Metal Atoms.- All-Transition Metal Aromaticity and Antiaromaticity.