are low-density gases. are not abundant on Earth. have complete outermost energy levels. have two electrons in their outermost energy level.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The noble gases, helium, neon, argon, krypton, xenon, and radon, rarely react with other elements because they
Possibilities:
- are low-density gases.
- are not abundant on Earth.
- have complete outermost energy levels.
- have two electrons in their outermost energy level.

have complete outermost energy levels.