The structure and characteristics of chemical elements, by what principle they are indicated in the Mendeleev table, the amazing stories of their discovery and much more were told to pupils of secondary school № 14 of Zangiata district of Tashkent region by the head of the department of “Natural and mathematical disciplines” Turin Polytechnic University Tashkent, Doctor of Technical Sciences, academician Dilshat Ubaydullaevich Tulyaganov. Introducing pupils to the topic of the lesson, academician Tulyaganov emphasized that the discovery of chemical elements took place over a long period of time. So carbon, sulfur, iron, copper, silver, tin, gold, mercury, and lead…