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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.
We choose this unit because it is on the order of a monatomic gas's volume: The above shows that at STP there is plenty of room between gas particles, so that the assumption that real gases do not feel each other is a fair approximation. It is still desirable to have gaseous state models which apply under low volumes or high pressures- conditions which force the molecules in close proximity where their intermolcular forces do become important.