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In the covering atomic model, electron occupy different energy levels, or shells. The K and L shells are presented for a neon atom.

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

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In 2006, scientists at the joint Institute because that Nuclear study in Dubna, Russia, announced that oganesson, the next noble gas, had been made in 2002 and 2005 in a cyclotron. (Most aspects with atom numbers greater than 92—i.e., the transuranium elements—have to be made in particle accelerators.) No physics or chemistry properties that oganesson have the right to be directly determined due to the fact that only a few atoms that oganesson have been produced.