Answer: The valency of potassium is 1.
Potassium has an electronic configuration of 2, 8, 8, 1. Only eight electrons should be required in the last shell, which contains one electron. Potassium can donate one electron in this way, resulting in 8 electrons in the outermost shell. The configuration will be 2, 8, 8 if potassium contributes one electron and becomes potassium ion.
As a result, the number of electrons that potassium must transfer in order to achieve stability is 1.
Note: Energy is required to remove or acquire an electron from an atom’s outermost shell. Ionization enthalpy is the energy required to remove an electron, while electron gain enthalpy is the energy required to contribute electrons.