General objective of this lecture is to present Halogens; Group 17. All the elements in Group 17 are nonmetals except for astatine, which is a radioactive metalloid. These elements are called halogens, which means “salt-former.” All of the halogens form salts with sodium and with the other alkali metals The halogen fluorine is the most reactive of the halogens in combining with other elements.
Halogens Group 17
