The following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture
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a
In alkali metals, the reactivity increases but in the halogens, it decreases with increase in atomic number down the group.
b
The reactivity decreases in the alkali metals, but increases in the halogens with increase in atomic number down the group.
c
In both the alkali metals and the halogens. the chemical reactivity decreases with increase in atomic number down the group.
d
Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens.
answer is A.
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Detailed Solution
The alkali metals are highly reactive due to their large size and low I.P . The reactivity of these elements increases downthe group.In case of halogens , reactivity decreases down the group.