(D) For alkali metals,reactivity increases down the group because the ionization energy decreases,making it easier to lose an electron.For halogens,re

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Reactivity increases in alkali metals,but it decreases in halogens with an increase in atomic number down the group.

(D) For alkali metals,reactivity increases down the group because the ionization energy decreases,making it easier to lose an electron.For halogens,reactivity decreases down the group because the electronegativity decreases,making it harder to gain an electron.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Chemical Reactivity

Medium

The periodic trend of chemical reactivity for alkali metals and halogens is described in the following statements. Which statement provides the correct concept?

A
Reactivity decreases in alkali metals,but it increases in halogens with an increase in atomic number down the group.
B
Reactivity decreases in both alkali metals and halogens with an increase in atomic number down the group.
C
Reactivity increases in both alkali metals and halogens with an increase in atomic number down the group.
D
Reactivity increases in alkali metals,but it decreases in halogens with an increase in atomic number down the group.