The reaction between potassium metal (K) and fluorine gas (F₂) is a vigorous and exothermic reaction that produces potassium fluoride (KF). This is a classic example of a combination reaction.

Here's the balanced chemical equation:

2K(s) + F₂(g) → 2KF(s)

Explanation:

* Potassium (K) is an alkali metal, highly reactive due to its single valence electron.

* Fluorine (F₂) is a highly electronegative halogen, eager to gain an electron.

* The reaction involves the transfer of one electron from each potassium atom to a fluorine atom, forming ionic bonds between potassium cations (K⁺) and fluoride anions (F⁻).

* The reaction releases a large amount of heat, leading to a bright flame and potentially explosive conditions if not carefully controlled.

In summary, the reaction between potassium and fluorine is a combination reaction resulting in the formation of potassium fluoride, accompanied by a significant release of energy.