Question

question 1-45
the noble gases, helium, neon, argon, krypton, xenon, and radon, rarely react with other elements because they
○ are low-density gases.
○ are not abundant on earth.
○ have complete outermost energy levels.
○ have two electrons in their outermost energy level.

Explanation:

Noble gases (helium, neon, argon, krypton, xenon, radon) rarely react because they have complete outermost energy levels (valence shells). Low - density, abundance on Earth, or two electrons (only helium has two, others have eight) don't explain their chemical inertness. Chemical reactivity is related to electron configuration, and noble gases have a stable, complete outer electron shell, so they don't easily form bonds.

Answer:

have complete outermost energy levels.