This resource includes 900 alphabetically arranged articles - 110 new to this edition - in all fields of chemistry (analytical, physical, organic, inorganic) and covers theory, laboratory methods and instruments, classes of compounds and reactions, materials, elements, and more. Also included are related subjects essential to the understanding of chemistry, such as atomic physics, quantum theory, statistical mechanics, and thermodynamics. The text is thoroughly cross-referenced and supplemented by numerous structural formulas and other illustrations.