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Elements that exist as monatomic gases under normal conditions? All of the Nobel gases exist as monatomic molecules under normal conditions. They form group 8A on the periodic table and are Helium, Neon, Argon, Krypton, Xenon, Radon. 6 people found this useful.
Elements of this nature will combine with atoms of the same element in order to be stable. In other words, hydrogen, a diatomic element, cannot be by itself. It cannot exist as simply H. Hydrogen is so reactive that when isolated from everything but hydrogen it will combine into a diatomic (two atom) molecule. Therefore, hydrogen gas, that is sometimes used as a fuel, exists as H2.