The noble gases are stable because they have how many electrons in their outer energy level?
2
4
6
or 8

Noble gases are the least reactive of all known elements. That's because with eight valence electrons, their outer energy levels are full. The only exception is helium, which has just two electrons. Noble gases are gaseous elements; Including , neon , argon, krypton xenon and radon. These gases belong to the group 0 (18) of the periodic table. I hope this helps 

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