How many elements are gases under ordinary conditions?

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Under ordinary conditions, there are 11 chemical elements that exist as gases. These include:

  • Hydrogen
  • Nitrogen
  • Oxygen
  • Fluorine
  • Chlorine
  • The six noble gases: helium, neon, argon, krypton, xenon, and radon.1

While oganesson is a member of the noble gas group, it is a synthetic, highly radioactive element that is believed to be solid at room temperature due to relativistic effects, rather than a gas.2