CHAPTER 4 - The Structure of the Atom

4.1 - Atomic Mass	.... page 80
4.3 - Subatomic Particles: Electrons, Protons, and Neutrons	.... page 82
4.4 - Electrons, Protons, and Neutrons. Atomic Number	.... page 83
4.5 - Isotopes	.... page 85
4.6 - Arrangement of Electrons in Principal Energy Levels	.... page 87
4.7 - Electron-Dot Formulas of Elements	.... page 89
4.8 - Arrangement of the Electrons in Sublevels	.... page 91
4.9 - Orbitals	.... page 97

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CHAPTER 5 - The Periodic Classification of the Elements

5.2 - The Periodic Table - Periods and Groups	.... page 106
5.3 - General Characteristics of the Groups	.... page 109