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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.
A number of elements are found in their elemental form as diatomic molecules. In these molecules, two atoms are joined by one or more covalent bonds, forming a molecule with the general formula X 2.