To achieve the goal of this book, which includes a detailed study of the chemistry of the elements of the President, had to be streamlining some of the concepts deep abandoned some unnecessary details. This book contains sections on the Presidents, the first section contains some of the necessary theoretical concepts, Part II contains elements which President periodic tightness top the agenda, the book has tried to address in detail and focused on some of the elements; view of the importance of daily with emphasis in the introduction to the study of each component the similarities and differences between him and other elements.