Aiming to present material in a manner which makes it accessible to a wide range of students of differing needs, this book contains the relevant data for courses leading to examinations in chemistry at all levels. It includes not only standard numberial data about the 109 elements, but also information concerning the discovery, sources, extraction, properties, uses and biological roles of the elements and their compounds. There is a section showing periodic trends in graphic form, and other data includes standard heat of formation, standard Gibbs' free energy of formation, standard entropy and pKa related to a variety of inorganic and organic compounds and infra-red data related to organic compounds.