What is the reason noble gases are considered chemically inert?

Noble gases are considered chemically inert primarily because they have full outer electron shells. This electron configuration, characterized by a complete set of valence electrons, makes them particularly stable. Elements tend to react in order to achieve a stable electron configuration, often by gaining, losing, or sharing electrons. However, noble gases, such as helium, neon, argon, krypton, xenon, and radon, naturally possess a stable arrangement, which minimizes their tendency to engage in chemical reactions.

While other options may relate to noble gases in some context, they do not define why these gases are chemically inert. For instance, although noble gases are often found in relatively small quantities compared to more reactive elements, this does not directly contribute to their lack of chemical reactivity. Similarly, low boiling points are a physical property rather than a chemical one, and while noble gases do not typically form stable compounds, their primary reason for chemical inertness stems from their full outer shells.