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.
Question: The noble gases, helium, neon, argon, krypton, xenon, and radon, rarely react with other elements because they
A. are low-density gases.
B. are not abundant on Earth.
C. have complete outermost energy levels.
D. have two electrons in their outermost energy level.
Answer: