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[ ? ] Alkali metal:
Soft, bright, silvery metal. Reactive.
Potentially explosive. Store in dry, inert, oxygen-free atmosphere.

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.

Sodium is considered to be a member of the "alkali metal" class of element. At a pressure of 101.325 kPa, it has a boiling point of 883 °C, and a melting point of 97.8 °C

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.