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⇒ Noble gases are group 18 elements. Noble gases that naturally found are helium (He), Neon (Ne),Argon (Ar)Krypton (Kr), Xenon (Xe), and Radon (Rn).

⇒ They are also described as "inert" because they are very unreactive and are nearly always found in their element state and do not easily form compounds.

⇒ Noble gases are most stable elements, because they have a full outer shell of electrons. 

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