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The textbook is prepared according to the chemistry programme for grades 7-9 of secondary schools. It contains theoretical material from the sections "Periodic law and periodic table of chemical elements. Structure of an atom", "Chemical bonding and structure of matter", "Quantity of matter. Calculations by chemical formulas, «Main classes of inorganic compounds», practical works, laboratory experiments, exercises, problems, additional material for the curious, glossary of terms, subject index, list of references and Internet sites.