Question

which of the following combination of elements is the most reactive? (1 point) k and i na and br cs and br cs and i

Explanation:

To determine the most reactive combination, we analyze the reactivity of alkali metals (K, Na, Cs) and halogens (I, Br). Alkali metals become more reactive as we go down Group 1 (Cs > K > Na), and halogens become more reactive as we go up Group 17 (Br > I). The reaction between an alkali metal and a halogen is an ionic bond formation. The greater the difference in electronegativity and the higher the reactivity of the individual elements, the more reactive the compound. Cs is the most reactive alkali metal (lowest ionization energy), and Br is more reactive than I. Among the options, Cs (most reactive alkali) and Br (more reactive halogen than I) will form the most reactive compound.

Answer:

Cs and Br