Metal atoms produce a rich chemistry with unique properties and are of considerable interest in academic, government, commercial, and regulatory sectors. Although there is considerable literature documenting the use of quantum chemistry calculations in the study of metallic systems, there are few books that collect and present this information in a comprehensive format. This volume focuses on state-of-the-art quantum chemical methodologies, emphasizing application to a wide variety of chemical systems containing metal atoms. The book explains the theory underpinning the methodologies, presents a practical set of modalities for studying metallic systems, assesses the current technological barriers, and examines future challenges and possibilities.