What is the necessity of introducing group 8 in periodic table?

Group 8 of the Periodic Table, also known as the noble gases, is essential because it includes elements like helium, neon, argon, krypton, xenon, and radon, which are characterized by their lack of reactivity due to a full valence electron shell. This unique property makes them invaluable in various applications, such as lighting (neon signs), inert environments for chemical reactions, and in cryogenics (helium). Introducing this group helps illustrate the trends in reactivity and stability in the periodic table, providing a clearer understanding of elemental behavior. Additionally, their distinct characteristics highlight the importance of electron configuration in determining chemical properties.