BROMINE (BR/35)

* Bromine is a member of the halogens family:

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   BROMINE / Br / 35 

   Bromine is normally in the form of a deep red, highly reactive
   diatomic liquid, Br2.  Two isotopes are found in nature:

     Br<79/35> / 51%
     Br<81/35> / 49%

   Both are stable.

     atomic weight:       79.904
     abundance:           62nd
     density:             3.1 gm/l
     melting point:       -7 C
     boiling point:       59 C
     valence:             1 3 5 7
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The "Br-" ion is known as "bromide". Bromine is primarily obtained from salt lakes, the Dead Sea being the biggest production source. It has some modest applications, with production in the hundreds of thousands of tonnes a year. One of its more prominent uses is in the synthesis of "halons", such as "halon-1301 (CBrF3)", which are used in fire-extinguishing systems on aircraft, ships, archives, and any other place where a blaze has to be put out quickly in a confined space. Methyl bromide (CH3Br) was once a popular and effective pesticide, but due to environmental concerns it is being phased out.