CBSE Class 9 Science, Chapter 8: Journey Inside the Atom
NCERT Exploration, pages 140–161. 17 topics, about 6 days of study at 20 to 30 minutes a day.
Topics in this chapter, with textbook pages
- Introductionpage 140
- 8.1Rediscovering the Roots of Atomic Theorypage 141
- 8.2A Short Historical Journey Through Atomic Modelspages 141–142
- 8.2.1Thomson’s model of an atompages 142–143
- 8.2.2Testing Thomson’s model: The gold foil experimentpages 143–145
- 8.2.3Bohr’s model of the atompage 146
- 8.3What Components Contribute to thepage 147
- 8.3.1Discovery of the Neutronpages 147–148
- 8.4Symbols of Elementspages 148–149
- 8.5Atomic Numberpages 149–150
- 8.6Mass Numberpage 150
- 8.7How Are Electrons Distributed in Different Energy Levels?pages 151–152
- 8.8Combining Capacity of an Atom: Valencypage 153
- 8.9A Deeper Look into Atomic Structurepage 154
- 8.9.1Isotopespages 154–157
- At a Glancepage 157
- Revise, Reflect, Refinepages 158–160
Teach this chapter at home
- A day-by-day plan with the exact textbook pages for each day.
- A step-by-step script for each day, so you know what to say and ask, written from the NCERT chapter.
- A quiz at the end and a written task you can check with a photo of the notebook.
Textbook pages follow the 2026-27 NCERT print and can differ by a page or two in older prints. Adhian Gurus is not affiliated with NCERT or CBSE.