Question

why do you think noble gas are placed in separate groups​

Answer 1

Explanation:

As they have their outermost shell completed with electrons and also they have zero valency. They must be placed in a different group.

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Answer 2

Answer:

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.