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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.
In their elemental form at room temperature, the Group 8A elements are all colorless, odorless, monatomic gases. The Group 8A elements have a full octet of eight valence electrons in their highest-energy orbitals (ns 2 np 6), so these elements have very little tendency to gain or lose electrons to form ions, or share electrons with other elements in covalent bonds.