Which of the following elements would you classify as a noble gas, and why are noble gases distinct from other groups of elements?

The noble gases are helium, neon, argon, krypton, xenon, and radon; they are found in Group 18 of the periodic table. They have completely filled outer electron shells, so they have no tendency to gain or lose electrons and are chemically inert. Because of this stable electronic configuration, noble gases rarely form compounds, unlike most other groups that readily share or transfer electrons. For example, helium’s single 1s electron pair is already full, so it does not react with other elements, whereas sodium in Group 1 has only one valence electron and reacts violently with water. This unique stability explains why noble gases are so distinct from other elements.