Atomic Structure

A Physical Chemistry unit for JEE Main 2027 (typically 3-5% of the paper). It covers the nature of electromagnetic radiation and the photoelectric effect, the Bohr model of the hydrogen atom and its spectra, the dual nature of matter (de Broglie) and the Heisenberg uncertainty principle, the quantum-mechanical model with quantum numbers and orbital shapes, and the rules governing electronic configuration (Aufbau, Pauli, Hund).