Sodium ion, represented as Na+, is a positively charged ion formed when sodium atoms lose one electron. This process occurs because sodium has one electron in its outer shell, making it eager to lose that electron to achieve a stable electronic configuration. Sodium ions play a crucial role in various biological processes, including nerve impulse transmission and muscle contraction. In addition to its biological significance, sodium ions are also important in electrolyte balance within the body. They help regulate fluid balance and blood pressure. Sodium ions are commonly found in table salt, or sodium chloride, which is a primary source of sodium in our diets.