Chemistry ORGANIC PHOTOCHEMISTRY AND PERICYCLIC REACTIONS ATOMIC NUCLEUS Analytic chemistry Atom Chemistry-Technology of Industrial Chemicals Cycloaddition Dyes and dyeing ISOTOPES AND ISOBARS NUCLEAR CHEMISTRY NUCLEAR MODELS Nuclear Chemistry Organic photochemistry PERIODIC TABLE AND PERIODIC PROPERTIES Pericyclic reaction Physics Polarographic methods-Analytical chemistry Quantum mechanics; Physics RADIO ACTIVITY SOLID STATE CHEMISTRY