Here's why:
* Electron Configuration: Potassium's electron configuration is [Ar] 4s¹.
* Valence Shell: The outermost shell (4th shell in this case) is called the valence shell.
* Valence Electrons: The electrons in the valence shell are the ones involved in chemical bonding.
Since potassium has only one electron in its 4s orbital, it has one valence electron.
