We see the word "sodium" every time we look at the nutrition label on a food or drink we buy at the store. But what does the word actually mean? What is sodium? Readers find out in this clear and engaging guide to one of the most well-known elements on the periodic table. As readers explore the detailed main text and sidebars, they build their knowledge of crucial chemistry topics, and that knowledge is enhanced with the help of visual elements, such as photographs, diagrams, tables, and chemical equations.