1. Atomic Particles, Photons and the Quantization of Electron Energies; Heisenberg's Uncertainty Principle -- 2. Atomic Orbitals -- 3. The Electronic Configurations of Atoms; the Periodic Classification of the Elements -- 4. Periodicity I: Some Atomic Properties; Relativistic Effects -- 5. Periodicity II: Valencies and Oxidation States -- 6. Periodicity III: Standard Enthalpies of Atomization of the Elements -- 7. Periodicity IV: Fluorides and Oxides
