# What is the most stable potassium ion?

There is only one stable potassium ion, ${K}^{+}$
The cation ${K}^{+}$ is formed when an atom of potassium loses its single valence electron (a $4 s$-electron). This process requires very little energy (the ionization energy of potassium is relatively low), and so the element is readily oxidized (it is a strong reducing agent).