The chapter “Structure of Atom” in Class 9 Science explains the fundamental composition of matter at the atomic level. Students learn that atoms are made up of three subatomic particles: protons, neutrons, and electrons. Protons carry a positive charge, electrons a negative charge, and neutrons are neutral, and together they form the nucleus and electron cloud of an atom.
The chapter also covers the historical development of atomic models, including Dalton’s, Thomson’s, Rutherford’s, and Bohr’s models, explaining how the understanding of atomic structure evolved over time.
Important concepts such as atomic number, mass number, isotopes, and isobars are introduced to help students understand chemical properties and reactions. NCERT Class 9 Science uses simple explanations, diagrams, and examples to make these abstract concepts easy to grasp.
Learning this chapter provides a strong foundation for chemistry and higher studies in atomic theory.
