In this lesson our instructor talks about the chemistry of transition metals. First, he discusses coordination compounds, nomenclature of coordination compounds, and structures of coordination compounds. Then he talks about isomers of coordination compounds, electronic structure, and implications of electronic structure. He ends the lesson with a summary and two helpful sample problems. The Chemistry of The Transition Metals Coordination compounds contain a central metal atom/ion attached to ligands, which may be atoms and/or molecules. Coordination compounds are often observed with coordination numbers of 4 or 6, giving tetrahedral, square-planar, and octahedral geometries. A set of rules exists for nomenclature (naming) of coordination compounds. Crystal-field theory can explain both the color and magnetism of coordination compounds.