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Noble gasses have the simplest chemical properties. In general, noble gasses do not react with other elements.

Most gasses such as hydrogen, oxygen, and nitrogen react with themselves to produce diatomic molecules. This is why you will see the symbols H2, O2 or N2 in chemistry books or in reference to these gasses. These molecules of gas share electrons in chemical bonds and are more stable than the monatomic gasses.

Noble gasses do not form dimer molecules. Helium, argon, krypton, xenon, radon all exist in nature as monatomic gasses. What's more, because their outer shell of electrons is complete, they neither lose nor gain electrons and thus do not react with other elements to form compounds.

There has been found an exception to this general rule. In the case of xenon, it has been found that under certain conditions xenon will react with fluorine to form a crystalline compound of xenon hexafluoride. These crystals have been made in the laboratory. They have a hexagonal lamellar form. Xenon hexafluoride is highly unstable and will explode with only slight input of energy. As far as I know, this is the only example of chemistry happening in the noble gas family.

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