Readers can find potassium in their kitchens. This silvery white element is in bananas, avocados, nuts, chocolate, and potatoes. It's also found in ocean water. In the human body, potassium helps keep our bones healthy and our muscles contracting properly. Potassium is used in many everyday items, such as fire extinguishers, fertilizers, soaps, and batteries. K is potassium's symbol, from the Latin word kalium. This book helps students better understand the basics of chemistry as they learn what potassium is and how this soft metal is used in our world.