M. "Science", 1969. - 194 s. This book, dedicated to the 100th anniversary of the law of periodicity, provides a comprehensive analysis of the process of discovery of D. and . Mendeleev periodic law and the development of a periodic system of elements. The problem of prediction and discovery of new elements in connection with the law of periodicity is considered. This problem has now become extremely relevant due to the establishment of research on the synthesis and detection in nature of superheavy transuranic elements. In this regard, the question of the content of the concepts of “criterion of reliability of synthesis” and “criterion of reliability of discovery” . was discussed. The book provides for the first time a chronology of the main events in the development of the law of periodicity and the periodic system of elements for 100 years, with appropriate bibliographic references given to the original sources. The book is designed for a wide range of readers - researchers, graduate students, teachers of universities and schools, students - specialists in the field of chemistry, physics, history and philosophy of natural science .. Tables1, Illustrations 25, Bibl. 60 titles.