Which electron configuration represents a noble gas?

The correct choice represents the electron configurations of noble gases, which are characterized by having a complete valence shell. Noble gases are found in Group 18 of the periodic table and are known for their stability and low reactivity due to this full outer shell.

The selected answer includes neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe), all of which are noble gases. Each of these elements has a fully occupied valence shell: neon has 8 electrons in its outer shell, argon also has 8, krypton has 8, and xenon has 8. This complete electron configuration is what distinguishes noble gases from other elements, making them chemically inert under standard conditions.

In contrast, the other options provided contain elements that either do not belong to the noble gas category or include noble gases along with other types of elements. Therefore, the choice that exclusively lists noble gases confirms that the electron configuration being asked about correctly represents this stable group of elements.