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   Be

BERYLLIUM

(Gr. berryllos, beryl; also called Glucinium or Glucinum, Gr.glykys, sweet)

Be at. wt. 9.0122 
   at. no.4
   m.p. 1278° ±5° C
   b.p. 2970° C (5 mm)
   sp.gr. 1.848  (20° C)
   valence 2
Electronic configuration
 SHELL  K L M N O P Q
 SUB  SHELL He Neon Argon Krypton Xenon Radon Eka-radon
1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p 4f 5d 6s 6p 5f 6d 7s 7p
Beryllium 1s22s2          
Symbol 1S0
Beryllium Discovered as the oxide by Vauquelin in beryl and in emeralds in 1798. The metal was isolated in 1828 by Wdhler and by Bussy independently by the action of potassium on beryllium chloride. Beryllium is found in some 30 mineral species, the most important of which are: beryl, chrysoberyl, and phenacite. Aquamarine and emerald are precious forms of beryl. Beryl (3Be().A1203.65i02) is the most important commercial source of the element and its compounds. Most of the metal is now prepared by reducing beryllium fluoride with magnesium metal. Beryllium metal did not become readily available to industry until 1957. The metal, steel gray in color, has many desirable properties. It is one of the lightest of all metals, and has one of the highest melting points of the light metals. Its modulus of elasticity is about one third greater than that of steel. It resists attack by concentrated nitric acid, has excellent thermal conductivity, and is nonmagnetic. It has a high permeability to x-rays, and when bombarded by alpha particles, as from radium or polonium, neutrons are produced in the ratio of about 30 neutrons/million alpha particles. At ordinary temperatures beryllium resists oxidation in air, although its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Beryllium is used as an alloying agent in pro- ducing beryllium copper, which is extensively used for springs, electrical contacts, spot-welding electrodes, and nonsparking tools. It is finding application as a structural material for high-speed aircraft, missiles, and spacecraft. It is used in nuclear reactors as a reflector or moderator for it has a low thermal neutron absorption cross section. It is used in gyroscopes, computer parts, and inertial guidance instruments where lightness, stiffness, and dimensional stability are required. The oxide has a very high melting point and is also used in nuclear work and ceramic applica- tions. Beryllium and its salts are toxic and should be handled with the greatest of care. Beryllium and its compounds should not be tasted to verify the sweetish nature of beryllium (as did early experimenters). The metal, its alloys, and its salts can be handled safely if certain work codes are ob- ser"'ed, but no attempt should be made to work with beryl- lium before becoming famfliar with proper safeguards. The maximum allowable concentration of beryllium dust in an 8-hr. day is recommended to be about 2u gms./cu. meter in working areas. The average monthly concentration should not exceed 0.01 p gms./cu. meter in non-working areas. Beryllium metal in vacuum cast billet form is priced roughly at $70/lb. Fabricated forms are more expensive.

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