Now We Can Understand Arrangement of the Periodic Table of Elements ·Trends in Atomic Size Trends in lonization Energy Trends in Electron Affinity Trends in Electronegativity Various Types of Chemical Bonds Combining Ratios of Oxides and Hydrides Shapes of Molecules IV-2Now We Can Understand • Arrangement of the Periodic Table of Elements • Trends in Atomic Size • Trends in Ionization Energy • Trends in Electron Affinity • Trends in Electronegativity • Various Types of Chemical Bonds • Combining Ratios of Oxides and Hydrides • Shapes of Molecules IV-2