why do you think the noble gases are placed in a separate group
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because it is non reactive. it is already in inert gases.
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Noble gases are placed in a separate group
Noble gases like He, Ne, Kr, Xe and Rn are placed in a separate group because of the following reasons: - They are extremely unreactive. - They donot combine with any other element of the periodic table. - All the noble gas elements have zero valency and placed in zero group with similar chemical properties.
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