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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.
So the gases are in the non-metals section. An unreactive gas would most commonly be found in group 18 (last column) on the periodic table of elements. These are the noble gases, and have 8 electrons on their outer shell, so they are very stable. Since they are stable, they are unreactive.They rarely react with other chemicals.rgon is an element with atomic number 18. It has very low melting and boiling points. Argon, is a non-metal element and noble gas.