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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.
An ion that isnt monatomic is SO4(2-), since it consists of 5 atoms. Group 2 elements often have a charge of 2+ because the ions like to achieve a noble gas state, which it does when it loses 2 electrons. For the non metals, it is monatomic if there is only one atom in the ion.hus, Na+ is a monatomic ion, whereas NH4+ is not. Anything with a charge (that is, anything that is not neutral or 0 charge) is an ion. Mg2+ is more charged than Na+. A molecule is diatomic if it has two atoms (which could be the same or different), triatomic if it has three atoms, and so on so forth.