Question

can anyone plzz help me in these question plzz... question no ...3 correct answer brainlest promises
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Answer 1

Reactivity of the alkali metals depends upon the ionization enthalpy of the metals. Since the ionization enthalpy of the alkali metals decreases with the increase in the size of the metal down the group. Therefore, the reactivity of the alkali metals increases down the group



Reactivity of the halogens depends upon the electron affinity of the halogens. Since the electron affinity of the halogens decreases down the group due to increase in the size of the halogen atoms. Therefore, the reactivity of the halogens decreases down the group.

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Answer 2

hiiii viewer here's ur answer

4) For any chemical species to act as a good reducing agent, it needs to have good tendency to give up electrons.

As the alkali metals are the most electropositive elements in in the periodic table, they act as best reducing agents.

3) Since, as far as I know, split merging is not possible:

Please see Why are halogens very reactive? and its alkali analogue Why are alkali metals very reactive?

The High School textbook answer would be: They are on opposite ends of the electronegativity spectrum. Alkali metals need to loose electrons for energetic stability, while halogens need electrons. Hence both are inflamed by burning passion for each other.

Once you know that electronegativity is partially a measure of reactivity, that answer becomes tautological, however. And you would need to delve into MO-type reasoning, which I am unqualified to do here. The High School answer suffices for most usual circumstances.

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