3.1: Elemental Videos 3.1.1: Chemical Properties 3.1.1.1: Boron (Chem Properties) 3.1.1.2: Chlorine (Chem Properties) 3.1.1.3: Group 16 (Chem Properties) 3.1.2: Environmental Properties 3.1.2.1: Chlorine (Env Properties) 3.1.3: Nuclear Properties 3.1.3.1: Chlorine (Nuke Properties) 3.1.4: Overview 3.1.4.1: Beryllium (Overview) 3.1.4.2: Chlorine (Overview) 3.1.4.3: Fluorine (Overview) 3.1.4.4: Group 14 (Overview) 3.1.4.5: Group 15 (Overview) 3.1.4.6: Group 17 (Overview) 3.1.4.7: Group 1 (Overview) 3.1.4.8: Group 2 (Overview) 3.1.4.9: Lithium (Overview) 3.1.4.10: Neon (Overview) 3.1.4.11: Nitrogen (Overview) 3.1.4.12: Oxygen (Overview) 3.1.4.13: Sodium (Overview) 3.1.5: Physical Properties 3.1.5.1: Aluminum (Phys Properties) 3.1.5.2: Beryllium (Phys Properties) 3.1.5.3: Calcium (Phys Properties) 3.1.5.4: Carbon (Phys Properties) 3.1.5.5: Chlorine (Phys Properties) 3.1.5.6: Fluorine (Phys Properties) 3.1.5.7: Group 13 (Physical) 3.1.5.8: Group 18 (Physical) 3.1.5.9: Helium (Phys Properties) 3.1.5.10: Hydrogen (Phys Properties) 3.1.5.11: Lithium (Phys Properties) 3.1.5.12: Magnesium (Phys Properties) 3.1.5.13: Neodymium (Phys Properties) 3.1.5.14: Neon (Phys Properties) 3.1.5.15: Nitrogen (Phys Properties) 3.1.5.16: Oxygen (Phys Properties) 3.1.5.17: Sodium (Phys Properties) 3.1.5.18: Vanadium (Phys Properties) 3.1.5.19: Argon (Phys Properties) 3.1.5.20: Chlorine (Phys Properties) 3.1.5.21: Phosphorus (Phys Properties) 3.1.5.22: Silicon (Phys Properties) 3.1.5.23: Sulfur (Phys Properties)