1.1: What is Inorganic Chemistry? 1.2: The Nuclear Atom 1.3: Chemical Elements 1.4: Discovery of Subatomic Particles and the Bohr Atom 1.5: The Schrödinger equation, particle in a box, and atomic wavefunctions 1.6: Quantum Numbers and Atomic Wave Functions 1.7: Shielding 1.8: Aufbau Principle 1.9: Periodic Properties of Atoms General periodic trends are specific patterns that are present within the periodic table; these are patterns in properties like electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements. Some of the general periodic trends are described in this section. 1.9.1: Ionization energy 1.9.2: Electron Affinity 1.9.3: Covalent and Ionic Radii