Class Lecture Notes for CHEM 21A at El Camino Community College

The following documents are lecture materials for Chapter 4 that will be used in class. Please download them and bring them to class.


  • Chapter 4, sections 4.1 & 4.2 - Noble Gas Configuration, Octet Rule, and Ionic Bonding
  • Chapter 4, section 4.3 - Ionic Compounds
  • Chapter 4, section 4.4 & 4.5 - Naming Binary Ionic Compounds
  • Chapter 4, section 4.6 - Covalent Bonding
  • Chapter 4, section 4.7 - Polyatomic Ions
  • Chapter 4, section 4.8 - Shapes of Molecules and Polyatomic Ions
  • Chapter 4, section 4.9 - The Polarity of Covalent Molecules
  • Chapter 4, section 4.10 - This section is already in sections 4.4, 4.5, 4.6, and 4.7 so there is no section 4.10
  • Chapter 4, section 4.11 - Other Interparticle Forces is an Adobe .pdf file