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why is the reaction between potassium (k) and chlorine (cl) considered an oxidation-reduction reaction?

k(s) + cl2(g) → 2kcl(s)

chlorine reduces in size when it reacts with potassium.
chlorine takes electrons from potassium in the reaction.
potassium reduces in strength when it bonds with chlorine.
potassium takes chlorine's place in the reaction.

Chlorine takes electrons from potassium in the reaction.

Explanation:

2K + Cl₂ ⟶ 2KCl

The KCl is an ionic solid.

It consists of K⁺ and Cl⁻ ions that are formed by the transfer of an electron from K to Cl.

The chlorine takes electrons from potassium, and Gain of Electrons is Reduction.

At the same time, potassium loses electrons to chlorine, and Loss of Electrons is Oxidation.

Both oxidation and reduction are occurring, so this is an oxidation-reduction reaction.