The basic aspects of transition elements are presented significantly in this book. The study of the electronic and magnetic properties of transition metals has yielded enormous amount of information. An attempt has been made in this volume present the complicated subject matter in a simple and easy to understand manner. To make clear the different aspects and for comparative studies the book has been divided into chapters. It is earnestly hoped that the book will serve as a textbook, source book and a reference book as it covers all aspects about transition elements. Purpose of this book, is to meet the needs of teachers who present this subject to students who do not have the time or perhaps the inclination to pursue it in depth, but who may also require explicit coverage of basic topics. Material of this type has been introduced in an elementary fashion and present only the main facts. The present book address it self-sufficient.