* Electron Configuration: Potassium has one valence electron (in its outermost shell). It's easier for potassium to *lose* this single electron to achieve a stable octet configuration (like the noble gas Argon) than to gain seven electrons.

* Electropositivity: Potassium is a highly electropositive element, meaning it has a strong tendency to lose electrons and become positively charged.

Therefore, potassium readily forms a K+ cation.