Question

observe the modern periodic table and explain the gradation in reactivity of halogen family

Answer 1

heya!

1. halogens belong to 17 group
2. as we go down the group the elctron affinity of an atom decreases and there by the reactivity also decreases.
3. so, down the group (from top to bottom) the reactivity of halogens decreases.
4. hence flourine (F) is the most reactive elements in halogens family.