Halogen - GCSE Chemistry Definition

Halogens are a group of non-metal elements found in Group 7 of the periodic table. They include fluorine, chlorine, bromine, iodine, and astatine. Halogens are known for being very reactive, which means they easily form compounds with other elements, especially metals. These elements have seven electrons in their outer shell and need one more to have a full shell, making them eager to bond with other elements. Halogens are used in everyday products, such as bleach, disinfectants, and in making certain plastics. Due to their high reactivity, these elements are usually found in compounds with other elements rather than existing on their own in nature.