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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.
Molecules and Chemical Formulas. Many elements are found in nature in molecular form; that is, two or more of the same type of atom are bound together. For example, the oxygen normally found in air consists of molecules that contain two oxygen atoms.We represent this molecular form of oxygen by the chemical formula O.The elements that normally occur as diatomic molecules are hydrogen, oxygen, nitrogen, and the halogens. Their locations in the periodic table are shown in Figure 2.15. When we speak of the substance hydrogen, we mean H.or example, a molecule of water consists of two hydrogen atoms and one oxygen atom. It is therefore represented by the chemical formula H. Several common molecules are shown in Figure 2.16. Notice how the composition of each compound is given by its chemical formula.