Why do you think the noble gases are placed in a separate group?
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Answer:
Noble gases like helium (He), Neon (Ne), and Argon (Ar) are chemicallyinert and are present in atmosphere in extremely low concentrations. Thus owing to their similar inert behaviour and similar electronic configuration, they are justified to be placed in a separate group.
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Explanation:
Nobel gases are placed in a separate group of the period ic Table because they are inert elements they are undereactive as their valencey cells are completely filled with electrons
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