This book (in three volumes) deals with the basic approaches of many branches of chemistry through its interest in the following subjects; Volume I includes: quantum theory and atomic structure (chapters from 1 to 5), discovery and periodic classification of chemical elements (chapters from 6 to 9), types and theories of chemical bonding (chapters 10, 11, and 13), and isomerism (chapter 12); Volume II includes: nomenclature of chemical species (inorganic compounds, chapter 14, organic compounds, chapters 15 and 16, and some natural compounds, chapter 17), chemical equation and types of inorganic and organic reactions (chapter 18), chemical calculation (chapter 19), oxidation-reduction reactions and their applications (chapters 20 and 21); and Volume III includes: chemical thermodynamics (chapter 22), solutions (chapter 23), chemical and ionic equilibrium (chapters 24, 25, and 26), and chemical kinetics (chapter 27).