ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Potassium. View of chunks of the metal potassium, one of the chemical elements. Potassium is a soft, highly- reactive alkali metal. At room temperature it oxidises in air and reacts violently with water, so it has to be covered with a film of oil. Potassium is never found in its natural state but as part of a compound. Potassium is the eighth- commonest element found in the Earth's crust, and it is also found in plant and animal tissue. Potassium compounds are used in a variety of industrial processes and are essential for living organisms. It has the chemical symbol K, an atomic number of 19 and an atomic weight of 39.098.
Model release not required. Property release not required.