In Class 4 Light
In Class 5 Essays and Electron Configurations
Inclass 6 Radial Probability diagrams
In Class 7 Intro Periodic properties
In Class 8 Periodic properties
In Class 9 Lewis dot, Resonance and Bond Lengths
In Class 10 Hybridization and VB
In Class 12 Basics, acidity of metal ions, and predominance diagrams
In Class 13 More Acids and Bases