Periodic+Properties+of+the+Elements

History of the Periodic Table Atomic Radius Ionic Radius Metallic Properties Ionic Compounds Ionization Energies Electron Affinity Electronegativity Effective Nuclear Charge Shielding Metals Nonmetals Metalloids Alkali Metals Alkaline Earth Metals Hydrogen Group 16 Oxygen Group Group 17 Halogens Group 18 Noble Gases