Final answer:
Noble gases are in the same group due to having full outer shells, making them unreactive.
Explanation:
The 'Noble Gas' non-metals are all in the same group of the periodic table because they all have a full outer shell of electrons. This full outer shell makes them extremely nonreactive and stable, hence they rarely form compounds. The noble gases, like helium, neon, and argon, exhibit this characteristic.
Learn more about Noble gases in the periodic table here:
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