There are 11 elements that are gaseous at room temperature (around 20–25°C). These include:
- Hydrogen (H)
- Nitrogen (N)
- Oxygen (O)
- Fluorine (F)
- Chlorine (Cl)
- The noble gases: Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn)
Most of these gaseous elements are located on the right side of the periodic table, with the noble gases being monatomic gases and the others (except noble gases) existing as diatomic molecules at room temperature
. Only two elements are liquids at room temperature-bromine and mercury-while the rest are solids or gases
. Thus, the total number of gaseous elements at room temperature is 11.
