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Which statement correctly describes how chemical reactivity changes down the group for alkali metals and halogens?

1. Reactivity rises with increasing atomic number down the group for both alkali metals and halogens.
2. In alkali metals, reactivity increases, whereas in halogens it decreases as atomic number increases down the group.
3. In alkali metals, reactivity decreases, whereas in halogens it increases as atomic number increases down the group.
4. Reactivity falls with increasing atomic number down the group for both alkali metals and halogens.

Correct answer: In alkali metals, reactivity increases, whereas in halogens it decreases as atomic number increases down the group.

Solution

This statement is correct because alkali metals become more reactive as they have a greater tendency to lose their outer electron with increasing atomic size, while halogens become less reactive as they have a harder time gaining an electron due to increased distance from the nucleus.

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