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In the shell atomic model, electrons occupy different energy levels, or shells. The K and L shells are shown for a neon atom.

Screened indigenous the cell nucleus by intervening electrons, the external (valence) electrons of the atoms of the heavier noble gases are organized less firmly and can be gotten rid of (ionized) an ext easily indigenous the atom than deserve to the electron of the lighter noble gases. The power required because that the removed of one electron is referred to as the first ionization energy. In 1962, while functioning at the college of brother Columbia, british chemist Neil Bartlett uncovered that platinum hexafluoride would eliminate an electron indigenous (oxidize) molecular oxygen to form the salt . The first ionization power of xenon is an extremely close to that of oxygen; for this reason Bartlett thought that a salt the xenon might be created similarly. In the exact same year, Bartlett established that that is indeed feasible to eliminate electrons from xenon by chemistry means. He proved that the communication of PtF6 vapour in the presence of xenon gas in ~ room temperature created a yellow-orange solid compound then formulated as . (This link is now well-known to it is in a mixture that , , and PtF5.) soon after the initial report the this discovery, two other teams the chemists independently prepared and subsequently report fluorides that xenon—namely, XeF2 and also XeF4. These accomplishments were soon adhered to by the preparation of other xenon compounds and of the fluorides of radon (1962) and krypton (1963).

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In 2006, scientists at the share Institute for Nuclear research study in Dubna, Russia, announced the oganesson, the next noble gas, had been made in 2002 and also 2005 in a cyclotron. (Most aspects with atomic numbers higher than 92—i.e., the transuranium elements—have to be made in fragment accelerators.) No physical or chemical properties that oganesson deserve to be straight determined due to the fact that only a couple of atoms that oganesson have actually been produced.