1. Cody Johns

2.  Fluorine(F)  Chlorine(Cl)  Bromine(Br)  1886- Isolated by Ferdinand-Frèdèric- Henri Moissan (France).  1774- Prepared by Carl Wilhelm Scheele (Sweden), Identified by Sir Humphry Davy (UK) in 1810.  1826- Discovered by Antoine-Jérôme Balard (France).

3.  Iodine(I)  Astatine(At)  1811- Discovered by Bernard Courtois (France).  1940- Synthesized by Dale R. Corson & K.R. Mackenzie (USA) & Emilio Segrè (Italy/USA).

4.  All highly reactive with Alkali Metals  Also all very reactive with Alkali Earth Metals  All halogen family elements have 7 outer valance electrons

5. FLUORINE, CHLORINE, BROMINE, IODINE, ASTATINE

6. Uses Of These Elements Toothpaste Swimming Pool Cleaners Disinfectants Cooling Agents Photograph Water Cleaners