what class of elements includes all of the elements that are gases at room temperature
The elements that are gases at room temperature include hydrogen. They also include all the inert or noble gases, which are those elements in Group 18: helium, neon, argon, krâ¦ypton, xenon and radon. We also know that the halogens fluorine, chlorine and bromine are gases at room temperature (20Â°C). That leaves nitrogen and oxygen as the last of the elements that are gases at room temperature. All of these elements are nonmetals or halogens or inert gases. LAUGH OUT LOUD.