Sodium is a metallic element with a symbol ‘Na’ which is spread widely in nature, in the form of salts such as nitrates, carbonates, and chlorides. The metallic form of sodium is essential for making several organic compounds. The component sodium chloride (NaCl) is also found in various elements of nature. Sodium is the principal cation in the body’s extracellular fluid. It is also an essential nutrient needed to maintain plasma volume, acid-base balance, and normal cell functioning.