As of my last knowledge update in October 2023, there are 11 elements that exist naturally as gases at standard temperature and pressure (STP, which is 0 degrees Celsius and 1 atmosphere of pressure). These elements are:
- Hydrogen (H)
- Helium (He)
- Nitrogen (N)
- Oxygen (O)
- Fluorine (F)
- Neon (Ne)
- Chlorine (Cl)
- Argon (Ar)
- Krypton (Kr)
- Xenon (Xe)
- Radon (Rn)
These gases include both nonmetals and noble gases, and they all exist in gaseous form under standard conditions.