Bromine is more active.
Br
chlorine (Cl)
The one that is the farthest to the left and the farthest down.
Bromine would likely be more reactive. Little is known about the chemical properties of astatine because it is very rare and has a short half-life.
The least reactive is bromine.
The most reactive nonmetals are in group 17 (halogens). The most reactive metals are in group 1 (alkali metals).
Possibly not as gold is not very reactive. If they did bond it would be ionic.
Br-I
Br-I
The halogens, group 17, F, Cl, Br, I
We call them halogens.they are in the 17th group.
Halogens are very reactive: F, Cl, Br, I.