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“Noble Gases (Rare Gases)”  

Noble Gases (Group 18 Elements)

  In chemistry, six Noble Gases are elemental non-metal elemental gases (aka molecular gases), found in group 18 of the periodic table of elements.

The Stable Noble Gas

  The noble gas 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). Because of this full outer valence shell, noble gases are very stable non-reactive species.
  The noble gases includes:

• helium (He)
• radon (Rn)

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