The elements of group VII of the periodic table are called halogens, which means "salt formers".
Gases form very important components of many chemical reactions. In the periodic table of elements gases are mainly found in Group 17 and Group 18. The Group 17 gases are known as halogen gases and the Group 18 or zero group gases are known as the noble gases. Let us discuss the chemical properties of Group 17 in detail. The halogen family in the Group 17 of the modern periodic table has elements Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) and Astatine (At). Mnemonic: First Class Bakery In Austria.
Halogens exist in the elemental form as diatomic molecules. At room temperature fluorine and chlorine exist as ‘gas’ bromine is liquid and Iodine is a solid. The final member of the group, namely astatine, is intensely radioactive. Its most stable isotope has a half‐life of only 8.3 hours. Fluorine is the most electronegative element found in nature ‐ it loves to attract an electron and fill its shell.