How Are They Related?
All halogens have a seven-electron trait, they have seven electrons in their outer shell. They're one electron off from having a full shell, causing them to be able to combine with many different elements. They mostly combine with elements on the left side of the periodic table.
Halogens are also very reactive. On this website, there's a video showing experiments between halogens and aluminum. This shows how reactive halogens are and how they grow in reactivity from astatine to fluorine.
Halogens are also very reactive. On this website, there's a video showing experiments between halogens and aluminum. This shows how reactive halogens are and how they grow in reactivity from astatine to fluorine.