TY JOUR TI CHEMISTRY - XXI CENTURY. PROBLEMS AND ACHIEVEMENTS IN THE DEVELOPMENT OF CHEMISTRY AS A UNITARY FUNDAMENTAL SCIENCE PART 1. CHARACTERISATION OF THE PRESENT STAGE OF CHEMISTRY DEVELOPMENT KW STAGES OF NATURAL SCIENCE DEVELOPMENT KW CLASSIFICATION OF SCIENCES KW CHEMISTRY KW PROBLEMS OF MODERN DEVELOPMENT KW NEW CHEMICAL IDEOLOGY KW FUNDAMENTAL PRINCIPLES OF UNIFIED CHEMISTRY JO Herald of Technological University AU , .. PY 2026 IS 29 PB Kazan National Research Technological University