Question

why do you think the noble gases are placed in a separate group​

Answer 1

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this is because they are highly unreactive and do not form compounds with other elements.

Answer 2

Explanation:

Yes, all noble gases are seperated and placed in 18th group of periodic table.

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable.