Graduate level textbook in atomic physics.The book presents a new conceptual approach to atomic structure, suitable as a textbook for an introductory graduate course or as a resource for an undergraduate quantum mechanics course. It utilizes conceptual semiclassical models to introduce empirical systematizations of measured data. These transparently reveal the dynamical behavior of the various interactions that specify the energies and lifetimes of complex atoms. The historical basis of the field is emphasized, as is the relationship to modern fundamental theory. Many worked examples provide connections with astrophysics, chemistry, condensed matter, and other related fields.The book presents a new conceptual approach to atomic structure, suitable as a textbook for an introductory graduate course or as a resource for an undergraduate quantum mechanics course. It utilizes conceptual semiclassical models to introduce empirical systematizations of measured data. These transparently reveal the dynamical behavior of the various interactions that specify the energies and lifetimes of complex atoms. The historical basis of the field is emphasized, as is the relationship to modern fundamental theory. Many worked examples provide connections with astrophysics, chemistry, condensed matter, and other related fields.Lorenzo Curtis offers a new conceptual approach to atomic structure that utilizes conceptual semiclassical models to introduce empirical systematizations of measured data. These models reveal the dynamical behavior of the various interactions that specify the energies and lifetimes of complex atoms. Curtis emphasizes the historical basis of the field as well as the relationship to modern fundamental theory. He also includes many solved problems that provide connections with astrophysics, chemistry, condensed matter, and other related fields.1. Introduction; 2. Classical position probability densities for periodic systems; 3. Semiempirical parametrization of energ