Noble or inert gases belong to the group 8A and have completely filled stable, outermost shells. The outermost electronic configuration of the noble gases can be represented as,
1. Helium - [tex] 1s^{2} [/tex]
2. Neon - [tex] [He]2s^{2}2p^{6} [/tex]
3. Argon - [tex] [Ne]3s^{2}3p^{6} [/tex]
4. Krypton - [tex] [Ar] 3d^{10}4s^{2}4p^{6} [/tex]
5. Xenon - [tex] [Kr] 5d^{10}6s^{2}6p^{6} [/tex]
6. Radon - [tex] [Xe] 4f^{14} 5d^{10}6s^{2}6p^{6} [/tex]
So, the correct answer will be noble gases.
