Question

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

Answer 1

Noble gases:

• Noble gases belong to the group $-18$ and it is a $\mathrm{p}-$block element.
• It is also called rare gases or zero gases as they occur in a rare amount in the atmosphere.
• They are extremely low reactive due to their filled stable electronic configuration ${\mathrm{ns}}^2{\mathrm{np}}^6$.
• It contains seven elements.

Separate group$-18$:

• The noble gases are placed in a separate group because of their low reactivity when compared to other group elements.
• The noble gas occurs in lower concentrations in the atmosphere.
• These elements do not combine with other elements in the periodic table except Xenon.
• They have a stable electronic configuration of ${\mathrm{ns}}^2{\mathrm{np}}^6$. So, they are kept in a separate group.