The noble gases are essentially non-reactive. this is because a. they are all rare gases. b. their inner electron shells are all full. c. their valence electron shells are all full. d. they are in need of more valence electrons.

What effects result when there is an impact between earth and an asteroid? check all that apply. a. massive flooding. b. extinction of many life forms. c.major earthquakes change in average global temperature. d. giant dust cloud