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 so·di·um /ˈsodiəm/
 鈉

 so·di·um /ˈsodɪəm/ 名詞
 普羅比妥鈉

 So·di·um n.  Chem. A common metallic element of the alkali group, in nature always occuring combined, as in common salt, in albite, etc. It is isolated as a soft, waxy, white, unstable metal, so highly reactive that it combines violently with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). Atomic weight 22.990.  Specific gravity 0.97.
 Sodium amalgam, an alloy of sodium and mercury, usually produced as a gray metallic crystalline substance, which is used as a reducing agent, and otherwise.
 Sodium carbonate, a white crystalline substance, Na2CO3.10H2O, having a cooling alkaline taste, found in the ashes of many plants, and produced artifically in large quantities from common salt. It is used in making soap, glass, paper, etc., and as alkaline agent in many chemical industries. Called also sal soda, washing soda, or soda.  Cf. Sodium bicarbonate, and Trona.
 Sodium chloride, common, or table, salt, NaCl.
 Sodium hydroxide, a white opaque brittle solid, NaOH, having a fibrous structure, produced by the action of quicklime, or of calcium hydrate (milk of lime), on sodium carbonate. It is a strong alkali, and is used in the manufacture of soap, in making wood pulp for paper, etc. Called also sodium hydrate, and caustic soda. By extension, a solution of sodium hydroxide.
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 sodium
      n : a silvery soft waxy metallic element of the alkali metal
          group; occurs abundantly in natural compounds (especially
          in salt water); burns with a yellow flame and reacts
          violently in water; occurs in sea water and in the
          mineral halite (rock salt) [syn: Na, atomic number 11]

 sodium
 Symbol: Na
 Atomic number: 11
 Atomic weight: 22.9898
 Soft silvery reactive element belonging to group 1 of the periodic table
 (alkali metals). It is highly reactive, oxidizing in air and reacting
 violently with water, forcing it to be kept under oil. It was first
 isolated by Humphrey Davy in 1807.