This book is a description of an exciting journey through the columns and rows of the world's most famous table - the Periodic Table of Chemical Elements D.I. Mendeleev. Large groups, combining a significant number of elements, are presented here as "cities" with complex connections between their "inhabitants," and the "inhabitants" of the table cells amaze with their unique properties. The history of the discovery of chemical elements, information about how they are investigated in scientific laboratories, mined and used in industry and in everyday life, will undoubtedly interest all lovers of chemistry.