Quanta provides a non-mathematical and highly visual account of the concepts of quantum mechanics widely encountered in chemistry and related disciplines. Entries - ordered alphabetically - range in length from one paragraph to several pages, and describe the physical significance of each topic with simplicity and precision. Each entry is extensively cross-referenced and ends with a guide to sources of further information. This exciting new work continues the tradition of the first edition, which quickly established itself among students and teachers as a rich source of clear, concise explanations of quantum concepts. The text has been completely all topics have been brought up to date, and there are many more illustrations and numerous new entries. The book will be invaluable to students for its brief non-mathematical summaries of key concepts, to instructors as a source of explanations, illustrations, and references, and to all practising scientists searching for an interesting, accessible account of any aspect of quantum chemistry.