Question

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

Answer 1

Answer:

The noble gases like helium, neon. argon, krypton and xenon are placed in a separate group because these are inert ( un-reactive ) and present in very low concentration in the atmosphere. Also theri properties do not resemble with any other group.

Answer 2

Answer:

noble gases are placed in a separate group because all the noble gases have the same property that they are chemically inactive and have eight elctrons in their balance shell

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