Sodium is a chemical element, having the chemical symbol Na. Its atomic number (the number of protons) is 11. It has a standard atomic weight of 22.98977 g•mol −1, and is typically found as a solid in its elemental form.
It is easily oxidized to the +1 oxidation state and forms many salts. Elevated sodium levels in humans may lead to high blood pressure and other complications. The pure metal reacts violently with water.