Question

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

Answer 1

the group 17 contain the member of haleogen group they have similar formula a gradation is. observed in their physical state down the group fluroine. and chlorine are gas bromine is a liquid

Answer 2

The elements of Group-17 are commonly called as halogens. Halogens include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I) and Astatine (At). Astatine is a radioactive element.

The increasing order of reactivity of halogen is as follows:

At < I < Br < Cl < F

This can be explained by the electronegativity of halogens. Electronegativity is the electron attracting tendency of an atom. As electronegativty decreases down the group, so reactivity decreases down the group. The highest electronegativity is in Fluorine, so it is the most reactive and so on. The reactivity can also be explained on the basis of atomic radius. Atomic radius is the distance from center of the nucleus to the outermost shell. As atomic radius increases down the group, so reactivity decreases down the group since there will be least electron affinity and electron shielding.