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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.
noble gas (inert gas) Helium, neon, argon, krypton, xenon, and radon â the elements (in order of increasing atomic number) forming group 0 of the periodic table. They are colourless, odourless, and unreactive.oble gases. The noble gases are the six elements that make up Group 18 of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). At one time, this family of elements was also known as the rare gases.