On March 28, 2024, within the framework of conducting classes using active forms of educational activity, Zhadrina N.K., a chemistry teacher of the HMCDC, held an open lesson on the topic «Elements of the 17(VIIa) group». 

During the lesson, students were acquainted with the spread of halogens in nature, made up the electronic configuration of atoms according to the periodic table of elements, and were acquainted with the patterns of these elements.