The bond that happens between potassium and oxygen is an ionic bond. This is because potassium is a metal, and oxygen is a nonmetal. When a metal and a nonmetal bond, the metal will lose electrons to the nonmetal, creating positive and negative ions. These ions are then attracted to each other, forming an ionic bond. In the case of potassium and oxygen, potassium will lose one electron to oxygen, creating K+ and O2- ions. These ions will then be attracted to each other, forming an ionic bond.