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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.
Therefore, we should not be surprised that when many monatomic ions form, they gain or lose electrons to achieve a 1s2 or ns2np6 configuration. For example, lithium forms Li+, with the 1s2 configuration, magnesium forms Mg2+, with the 2s22p6 configuration for its highest energy electrons, and chlorine forms Cl-, with the 3s23p6 configuration.