Learn about the sub-atomic particles and the various models of the atom , based on experiments and observations. Find out how electrons, protons and neutrons are arranged within the atom and how they determine its properties. Get Class 9 Science Chapter 4 Structure of the Atom notes with key concepts. Download free PDF for 2025-26 and boost exam prep now! Master Chapter 4 Class 9 - Structure of Atom with comprehensive NCERT Solutions, Practice Questions, MCQs, Sample Papers, Case Based Questions, and Video lessons. 8.0 Key Features of CBSE Science Notes for Class 9 Chapter 4 Structure of the Atom Complete Chapter Coverage: Includes all important topics like atomic models, subatomic particles, electronic configuration, valency, and isotopes.