Why is Helium considered a noble gas? What are the characteristics of noble gases?

List other gases in the noble family.

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Many mistakenly believe that a characteristic of noble gases is that they have to have 8 electrons. This is, of course, not true. Noble gases simply must have a full outer shell. The first shell should only have two electrons (which is what helium has). Other noble gases include such substances as neon, argon, krypton, xenon, and radon