The chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.990. It is a soft, waxy, silvery, reactive alkali metal that is never found unbound in nature.

plural of sodium

(chemistry) The sodium salt of lactic acid; used as a food additive and ingredient in lotions etc.

(chemistry) The unstable sodium salt of hypochlorous acid, NaOCl, used as a bleach and a fungicide.

(pharmacology) Thiopental.

(chemistry) The salt of sodium and citric acid with the chemical formula Na₃C₆H₅O₇ and used primarily as a food additive.

(physics) The only stable isotope of sodium, ²³₁₁Na, having eleven protons and twelve neutrons

(chemistry) A hydrido complex, NaBH₄; it is a selective reducing agent used in many industrial applications.

(chemistry) a white, crystalline salt, NaN₃; it is explosive, and is used in automobile airbags

(chemistry) A salt of sodium hydroxide and carbonic acid, NaHCO₃. / This salt used in cooking as a raising agent, as an antacid, a cleaner, etc.