[Jewelry making - Article 00165] - [Orchid] The halogens

[John Burgess]

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    The four elements called halogens are 

    1)  Chlorine; Cl. a greenish-yellow gas heavier than air, corrosive,
    very poisonous and choking.  

    2)   Bromine; Br. A dark brown very heavy liquid gives off choking
    brown fumes extremely corrosive and poisonous.    

    3)  Iodine;  I. Very dark brown crystals, gives off purple vapour on
    gentle heating. Corrosive and poisonous.  

    4)  Astertine  Very rare, strongly radioactive. only available in
    very specialized laboratories  Thus the halogens form a special group
    in the Atomic Table, and have similar chemical properties. Chlorine
    combines with the metal sodium to produce sodium chloride, table
    salt.  Bromine forms similar salts with sodium metal, making sodium
    bromide.  Iodine and sodium gives sodium iodide. All the halogens are
    highly reactive and combine with hydrogen to form corrosive acids;
    examples;  Hydrochloric acid,  Hydrobromic acid, Hydriodic acid. And
    of course, combine with many other basic chemicals producing salts. 

    A salt is produced by the combination of an acid with an alkali or
    base. 

    And I think that is enough chemistry for now. But further questions
    are quite welcome. 

Cheers for now,
JohnB of Mapua, Nelson NZ

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