The course of lectures contains theoretical material and additions in the form of examples of problems with brief solutions, as well as questions and problems for self-solution. The conceptual foundations of quantum mechanics of Schrödinger are presented. Some properties of atoms and molecules are considered. The zone theory and classification of crystalline solids have been substantiated. The main properties of atomic nuclei and elementary particles are described. The course of lectures is recommended for students of physical and mathematical faculties of universities.