The element represented by 'Na' on the periodic table is sodium. Sodium is an alkali metal, sharing group 1 with other elements like lithium and potassium. It has an atomic number of 11 and is known for its high reactivity, particularly with water, which produces hydrogen gas and sodium hydroxide. Sodium is essential for many biological processes, including nerve function and regulation of fluids in the body. In daily life, sodium primarily exists in the form of table salt (sodium chloride), widely used as a seasoning and preservative in various foods. It plays a crucial role in human nutrition and health.