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

(chemistry, inorganic chemistry) Common table salt, a compound composed of equal number of sodium and chlorine atoms. Chemical formula NaCl.

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

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

(chemistry) The sodium salt of sorbic acid.

(chiefly Britain) Alternative spelling of sodium sulfite

(inorganic chemistry, chiefly Britain) Alternative spelling of sodium bisulfite