"Version: 20240601"--Title page verso.Includes bibliographical references.0. Introduction -- part I. Physics of hydrogen. 1. Quantum physics of hydrogen atom -- 1.1. Hydrogen atomic spectrum -- 1.2. Quantum physics of hydrogen atom -- 1.3. Wave-particle duality of the electron and the Heisenberg uncertainty principle -- 1.4. Schr?odinger's wave equation of the hydrogen atom2. Covalent bonding a…