Question

______ is more reactive than bromine.

Answer 1

• Group 17 elements are known as halogens.
• The order of group 17 elements in decreasing order of their reactivity is: Fluorine $\left(\mathrm{F}\right)$ > Chlorine $\left(\mathrm{Cl}\right)$ > Bromine $\left(\mathrm{Br}\right)$ > Iodine $\left(\mathrm{I}\right)$.
• The reactivity of elements in group 17 decreases in going down the group because the size of the atom increases and the electronegativity decreases.

Hence, chlorine is more reactive than bromine.