Answer:
Hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon.
Explanation:
There is a classification by the physical stage at room temperature. Of 92 naturally occurring elements only 11 are gases for example oxygen and chlorine.
The elements also can be classified as metals and non metals, non metals are poor electrical conductors, 22 elements are non metals . In the non metal group some elements are called noble gases for example Helium and Neon.
All gases that are not metallic and are gases at room temperature are: He, Ne, Ar, Kr, Xe and Rn) hydrogen, nitrogen, oxygen, fluorine and chlorine.
