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Quick Answer.  Noble gases are unreactive because their outer electron shells are full and therefore in their most stable state. Normally, elements react with one another because they have incomplete electron shells. They lose, gain or share electrons in order to gain a more stable electron configuration.
As noble gases are mostly stable in unimolecular form, they doesn't react with much other compounds, thus its actually becomes difficult to find one in surroundings. Noble gases are inert gases. They don't easily react and thus, their compounds are rare. Plus, they are trace elements.