Why are nobel gases grouped together on the periodic table?

Nobel gases also referred as inert gases, they are grouped together because they are the most stable elements. This explains why they are nonreactive. They do not form chemical bonds because they only have a little tendency to either gain or lose an electron, since they have 8 electrons in the outer shell (except for helium as it has 2 electrons in the outer shell). As a result, they do not react with any other element in the periodic table.

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