Oxygen, helium, hydrogen, carbon dioxide, cabon monoxide, neon, nitrogen, sulfur dioxide, methane, krypton, and chlorine.
In addition to the elements and a few compounds listed by jmendez, there are literally thousands of other compounds that are gases, and of course thousands more liquids and solids that can be gaseous under proper conditions.
In addition to the elements listed by jmendez, the elements argon, fluorine, xenon, and radon are gases at normal surface temperatures and pressures.
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