Na⁺, or sodium ion, is a positively charged particle that forms when a sodium atom loses one electron. Sodium is an essential element found in many foods and is crucial for various bodily functions. It helps regulate fluid balance, supports nerve function, and plays a role in muscle contractions. In nature, Na⁺ is commonly found in table salt (sodium chloride) and is vital for maintaining the body's electrolyte balance. When dissolved in water, sodium ions help conduct electricity, making them important for processes like nerve signaling and muscle movement. Understanding Na⁺ is key to grasping how our bodies function.