Walsh Diagram

Walsh Diagram – Lecture 1 is a comprehensive study material covering the fundamental concepts and systematic construction of Walsh diagrams. It explains the relationship between molecular geometry, bond angle, molecular orbital energy, VSEPR theory, Molecular Orbital Theory (MOT), and Group Theory. The notes include the rules for drawing Walsh diagrams, symmetry analysis of atomic orbitals and ligand group orbitals, and symmetry-allowed orbital combinations. A detailed H₂O molecule case study compares linear (D∞h) and bent (C₂v) geometries, including molecular orbital diagrams, bond order, and changes in orbital energy with bond angle. The final section explains the Walsh energy diagram and the factors responsible for orbital energy changes during bending.