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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 the most simple case of a binary ionic compound with no possible ambiguity about the charges and thus the stoichiometry, the common name is written using two words. The name of the cation (the unmodified element name for monatomic cations) comes first, followed by the name of the anion.