sodium

Traductions

• anglais

  Date : 1983

  Définition

  An element. State: Solid; Group: IA; Atomic No.: 11; Atomic Wt.: 22.98977; Valence: 1. Sodium, the sixth most abundant element in the earth's crust and the most common alkali metal (Group IA), is a solf electropositive metal, m.p. 97.83 °C (208 °F); its compounds are more numerous than those of any other metal. It occurs in many natural compounds in the form of chloride, borate, carbonate, sulfate, and others.

  Note :

  The metal is made on a large scale by the electrolysis of molten sodum chloride mixed with calcium chloride. It reacts vigorously with water with formation of hydrogen and sodium hydroxide and the strong evolution of heat, and should be kept out of contact with water, as well as with air and oxygen. It readily forms compounds with the halogens, oxygen, and many other nonmetals, and alloys with a large number of metals, especially lead and mercury. Its chief uses are in the manufacture of tetraethyl lead and other organic and inorganic chemicals; the production of several metals, e.g., titanium and zirconium; as a heat-transfer agent (liquid) in reactors; and in electric power conduction. Sodium ion is essential to man and other animals whose chief intake of it is in the form of sodium chloride. Sodium is dangerous to handle, as it is corrosive to the skin, and also flammable when exposed to heat.

  Termes :

  1. sodium
  2. Na

  [Na] Symbol for the element sodium, taken from the Latin word natrium.