The third edition of this widely acclaimed reference book collects together the most important facts about all the chemical elements in a single easy-to-use guidebook. Not only in this edition has the author completely revised and updated his text, but he has also responded to reader demand for additional material. A major new chapter on the discovery and development of the periodic table has been added. The existing sections on the chemical, physical, nuclear, electron-shell, and environmental properties of elements have been updated and new sections on biological, crystal, and geological data have been added. There is also more information on the discovery, etymology, pronunciation and foreign names of the elements.