Element	Electron Configuration/Emission Spectrum	Common Compound(s)/Application(s)
9 Fluorine (F)		Sodium Fluoride (NaF)/Toothpaste Uranium Hexfluoride (UF6)/Uranium transportation Boron Trifluoride (BF3)/Neutron Detector Hydrofluoric Acid (HF)/Glass Etching Teflon (CnF2n+2)/Nonstick Frying Pans F18 (Half Life = 110 mins.)/PET Scan
17 Chlorine (Cl)		Sodium Hypochlorite (NaClO)/Bleach, Disinfectant Hydrochloric Acid (HCl)/Digestive Juice (in Stomach), Metel Treatment (to Remove Rust) Polyvinyl Chloride (PVC, (H2C2HCl)n)/Plastic (for Pipes and Bottles)
35 Bromine (Br)		Sodium Bromide (NaBr)/Hot Tub Disinfectant, Sedative Silver Bromide (AgBr)/Photographic Films Methyl Bromide (CH3Br)/Pesticide
53 Iodine (I)		Potassium Iodide (KI, 0.01% in Iodine Salt)/Goiter Prevention Silver Iodide (AgI)/Photographic Films, Cloud-seeding ~ (in Alcohol)/Antiseptic I131 (Half Life = 8 days)/Diagnosing Thyroid Diseases
85 Astatine (At)		Short half-life of 8.3 hours, very rare in natural form; decay product of U and Th. Treatment of thyroid cancer, radioactive tracer.

Group 17 Elements