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 rewritten and updated, and now includes many more illustrations, an extended bibliography, and numerous new entries. Quanta 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 almost any aspect of quantum chemistry.