CBSE Class 9 Science — Journey Inside the Atom
Chapter 8 of the CBSE Class 9 Science syllabus. About 83 minutes of teaching.
Unit: Matter - Its Nature and Behaviour
Unit weightage: 25 marks
6 topics
What is in this chapter
- 1Subatomic Particles — Electron, Proton, Neutron foundation12 min
- 2Atomic Models — Thomson, Rutherford, Bohr18 min
- 3Atomic Number and Mass Number12 min
- 4Distribution of Electrons in Shells foundation15 min
- 5Valency as Combining Capacity foundation14 min
- 6Isotopes and Isobars12 min
What to know first
No other chapter in this subject is listed as a prerequisite for this one, so you can pick it up without finishing the ones before it.
Where the marks are
CBSE publishes marks by unit, not by chapter. The Matter - Its Nature and Behaviour unit carries 25 of the 80 marks in the paper, across 3 chapters. Our estimate for this chapter alone is about 9 marks — useful for deciding what to study first, but it is our split of the unit, not an official CBSE per-chapter figure.
This chapter is not on the board yet.
We author chapters one at a time and only publish once the lesson has been checked end to end, so we would rather say "not yet" than ship a thin one. The syllabus above is accurate and free to use meanwhile.
Other chapters in Class 9 Science
Cell: The Building Block of LifeTissues in ActionDescribing Motion Around UsExploring Mixtures and their SeparationHow Forces Affect MotionWork, Energy, and Simple MachinesAtomic Foundations of MatterSound Waves: Characteristics and ApplicationsReproduction: How Life ContinuesPatterns in Life: Diversity and ClassificationEarth as a System: Energy, Matter, and Life