VIIA-Group ElementsHalogen Family (Sea-Salt Forming)VII A or Group-17 (ns2, np5)Fluorine (F2)Chlorine (Cl2)Bromine (Br2)Iodine (I2)Hydro Acids (HX)Oxides of ChlorineDichloro Oxide (Cl2O)Chlorine Dioxide (ClO2)Dichlorine Hexoxide (Cl2O6)Chlorine Heptoxide (Cl2O7)Oxy-acids of ChlorineHypochlorous Acid (HClO)Chlorous Acid (HClO2)Chloric Acid (HClO3)Perchloric Acid (HClO4)Bleaching Powder CaOCl2 or Ca(OCl)ClPractice Exercise