why do you think the noble gases are placed in a separate group?
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I think it would help u
Explanation:
Because. The groups are elements with the same number of electrons in the outer shell at least for the more common elements. Thenoble gases like helium,neon. argon, krypton and xenon areplaced in a separate group because these are inert ( un-reactive ) and present in very low concentration in the atmosphere.
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the Noble gases are completely filled with electron so Noble don't react with any other element to form a compound except xenon
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