Potassium is a chemical element with the symbol K and atomic number 19. It is an alkali metal and is highly reactive. In its ionic form, potassium has a charge of +1.
This charge is due to the loss of one electron from its outermost shell. Potassium has one electron in its outer shell, and it tends to lose this electron to achieve a stable electron configuration, similar to that of the noble gas argon. When potassium loses this electron, it becomes a positively charged ion, denoted as K+.
In summary, the charge of potassium in its ionic form is +1.