Potassium, being the 19th element on the periodic table, has both 19 electrons and 19 protons. With an atomic mass of approximately 39, potassium has 20 neutrons.
Potassium is a metallic element that falls in the alkali metal family. It was first discovered in 1807 by Sir Humphrey Davy. Potassium is one of the main electrolytes, and it is important for human health. Due to its high reactivity with water and other substances, it is used to make a wide variety of salts and specialty soaps. While potassium metal can be formed, it is rarely used in commercial applications, where sodium metal is typically preferred.