Question

Why do you think the noble gases are placed in a separate group class 10

Answer 1

$<p</p><p>style="color:cyan;font-family:cursive;background:</p><p>black;font-size:25px:">They are placed in a separate group due to their similarity in valence shell electron configuration i.e. they are all filled up.The groups are elements with the same number of electrons in the outer shell at least for the more common elements.$

Answer 2

Answer:

They are placed in a separate group due to their similarity in valence shell electron configuration i.e. they are all filled up. ... The groups are elements with the same number of electrons in the outer shell at least for the more common elements. The noble gases like helium,neon.