Answer :
Because they have a full outer electron shell they are quite happy staying on their own rather than bonding to other elements, this is why they are also known as inert gases.
noble gases do not form compounds readily because the are unreactive and inert.
Noble gases are referred to those elements found in Group 8A (or VIIIA) of the periodic table which are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
Generally most elements react with other elements by giving, accepting or sharing electrons to achieve an octet configuration that confers stability. Noble gases on the other hand already have octet configurations and therefore do not need to react with other elements or compounds.
Noble gases are therefore termed unreactive and inert.
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