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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.
This is a question for nuclear scientists to ponder. Monatomic elements also have no valence electrons available for reactions with other substances. In other words, monatomic elements have many properties similar to ceramic substances which are chemically inert.