Answer:
Elements placed in Group VIIIA of the periodic table are also known as the noble gases, and they are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
These elements do not take part in chemical reactions because they have a full outermost electron shell, also known as the valence shell. This means that their valence shell contains the maximum number of electrons that it can hold, and therefore, these elements do not have any electron available for bonding with other atoms.
In other words, their outermost electron shell is already stable, which means they have very low reactivity with other elements. Because of their unreactive nature, noble gases are often referred to as inert gases.