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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.
Oxygen is usually found as O2 gas and hydrogen as H2 gas for example. A diatomic molecule is a stable group of two atoms connected by chemical bonds. Diatomic molecules that are comprised of the same element are called diatomic elements. There are five diatomic elements that exist as gases at standard temperature and pressure: hydrogen, nitrogen, oxygen, fluorine and chlorine.