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Which statement accurately describes the trend in chemical reactivity of alkali metals and halogens as their atomic number increases within the group?

1. Reactivity rises with increasing atomic number for both alkali metals and halogens.
2. Reactivity grows for alkali metals but diminishes for halogens as atomic number increases.
3. Reactivity drops for alkali metals but rises for halogens with increasing atomic number.
4. Reactivity decreases for both alkali metals and halogens as atomic number increases.

Correct answer: Reactivity grows for alkali metals but diminishes for halogens as atomic number increases.

Solution

As atomic number increases within the group, alkali metals' reactivity grows due to lower ionization energy, while halogens' reactivity diminishes due to lower electronegativity.

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