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

The reactivity decreases in the alkali metals, but increases in the halogens with increase in atomic number down the group.

In both the alkali metals and the halogens. the chemical reactivity decreases with increase in atomic number down the group.

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 down

the group.

In case of halogens , reactivity decreases down the group.

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