Fluorine is the most reactive element of all in Group 7. You can see the trend in reactivity if you react the halogens with iron wool. Halogen Reaction with iron wool Fluorine Reacts with almost ...

Chlorine is more reactive than the iodine in potassium iodide solution: When a Group 7 element reacts, it gains one electron to form a negative ion with a stable electronic configuration – a ...