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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.
Monatomic hydrogen comprises about 75% of the elemental mass of the universe. Chemists noticed very long ago that when some gases (e.g. hydrogen, oxygen, chlorine) are being created e.g. during electrolysis or in reactions of metals with acids (hydrogen), they are radically more reactive than normally.