Final answer:
Noble gases are unreactive due to having complete electron shells, resulting in high ionization energies and a stable electron configuration which makes them chemically inert and eliminates the need to form bonds. The correct option is A.
Step-by-step explanation:
The noble gases, which include elements like helium, neon, and argon, tend not to react because they have complete electron shells. This complete valence shell, typically comprising eight electrons (except in helium, which has two), makes them chemically inert. They have high ionization energies, meaning they do not readily give up an electron, and any added electron would be placed in a significantly higher, and therefore less stable, energy level. Additionally, they already exhibit a full octet or, in helium's case, completely filled shells, providing them with a stable electron configuration without the need to form bonds.
The noble gases, such as helium, neon, and argon, tend not to react for several reasons. First, they have complete electron shells, meaning that their outer shells are already filled with the maximum number of electrons. This makes them stable and less likely to participate in chemical reactions. Second, they have high ionization energy, which means that it takes a lot of energy to remove an electron from a noble gas atom. This further reduces their reactivity. Finally, noble gases do not exhibit strong electronegativity, which is the ability to attract and hold onto electrons. Without a strong electronegativity, noble gases are less likely to form bonds with other elements.