what is the effect of atomic radius on the chemical reactivity of the halogens? Which is most the most active halogen? Which is the least active?

Answer 1

The reactivity of the halogens increases as one goes UP the table; i.e., F is the most reactive and I is the least. The smaller the radius the easier it is to ADD an electron to make the outside shell have eight electrons. F is the smallest radius and I is the largest radius.

Answer 2

Thank you! Now the whole lesson actually makes sense