How does potassium react with halogens such as bromine?

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A periodic table element box for potassium shows atomic number 19, symbol K, atomic weight 39.0983, electron configuration [Ar]4s1, and name potassium. Icons indicate it is an alkali metal, solid at room temperature, body-centered cubic crystal structure, and has strongly basic higher-valence oxides. A key explains the symbols for alkali metals, solid state, body-centered cubic structure, and strong basicity. — potassium Properties of potassium.

Potassium is highly reactive with halogens. When it comes into contact with liquid bromine, the reaction is violent and results in detonation.1

More generally, alkali metals can be burned in the presence of various halogens to produce the corresponding halides through highly exothermic reactions. Additionally, explosions have been observed when potassium is mixed with certain metal halide salts or organic-halogen compounds, particularly when subjected to shock.21