22 September
Complete bilingual TNPSC notes on Atomic Structure and Periodic Classification — Dalton, Thomson, Rutherford and Bohr models, atomic number and mass number, isotopes and isobars, electronic configuration, Mendeleev and Moseley, and periodic trends. With 15 key points, 5 MCQs, memory tricks and previous year questions for TNPSC Group 1, 2, 2A, 4 and VAO.