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write periodic gases and their symbols
 The six noble gases are found in group 18 of the periodic table. These elements were considered to be inert gases until the 1960's, because their oxidation number of 0 prevents the noble gases from forming compounds readily. All noble gases have the maximum number of electrons possible in their outer shell (2 for Helium, 8 for all others), making them stable.

    Helium              He
   
    Neon                 Ne
   
    Argon               Ar
  
    Krypton            Kr
   
    Xenon              Xe
   
   Radon               Rn


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