Question

Why are Nobel gasses are placed in separate groups?

Answer 1

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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.

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Answer 2

Nobel gases are chemically inert and are present in extremely low concentration in atmosphere. Thus owing to their similar inert behaviour and similar electronic configuration, they are placed in a separate group.

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