The process sees hot and metal-rich fluids interact with surrounding ... This alteration is shown by the presence of potassium-rich minerals, such as K-feldspar and muscovite, with gold ...

4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece of sodium metal is placed in water. The sodium reacts with the water and gets very hot, producing sodium ...

Potassium tarnishes so quickly that it is difficult to see that potassium is actually a shiny metal. This is further evidence that potassium is a more reactive metal than both lithium and sodium.