The growth of technology for chemical assessment has led to great developments in the investigation of chemical reactivity in recent years, but key information is often dispersed across many research fields. Combining original principles and rules with cutting-edge theories used in chemical reactivity analysis, Chemical Reactivity, Volume 1 presents the latest developments in theoretical chemistry and its application for the assessment of chemical processes. Beginning with an exploration of different theories and principles relating to electronic structure and reactivity of confined electronic systems, the book goes on to highlight key information on such topics as Dyson orbitals, universal potential energy curves, reaction fragility, equalization versus extremal principles and rules, and the Fukui function. Density functional theory is discussed in relation to numerous different principles and approaches, with further information on constrained methods and diabatic models, bonding evolution theory, orbital-based population analysis and charge transfer models, and quantum theory of atoms-in-molecules. Consolidating the knowledge of a global team of experts in the field, Chemical Reactivity, Volume 1: Theories and Principles is a useful resource for both students and researchers interested in gaining greater understanding of the principles and theories underpinning chemical reactivity analysis. Key features: Provides readers with the key information needed to gain a good overview of contemporary chemical reactivity studies and a clear understanding of the theory behind state-of-the-art methods in the: field, Highlights advances in the computational descriptions of reactivity, including reactivity in confined environments, conceptual density functional theory, and conceptual Ruedenberg bond theory, Provides comprehensive coverage by consolidating the knowledge of many well-known researchers in the field from around the world