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The textbook is prepared according to the Chemistry curriculum for the 11th grade of general secondary education (standard level). It summarises the content of the periodic law, the structure of atoms and ions, types of chemical bonding and chemical reactions, and describes the composition, structure, properties and applications of the most important simple substances and inorganic compounds. Contains practical work, laboratory experiments, exercises, problems, additional material for the curious, as well as a glossary of chemical terms, a subject index, a list of references for students and Internet sites with interesting material on chemistry.