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

Screened from the nucleus by intervening electrons, the outer (valence) electrons of the atom of the heavier noble gases are held less firmly and can be removed (ionized) an ext easily from the atoms than have the right to the electrons of the lighter noble gases. The energy required because that the removal of one electron is dubbed the very first ionization energy. In 1962, while working at the college of british Columbia, brother chemist Neil Bartlett uncovered that platinum hexafluoride would remove an electron indigenous (oxidize) molecular oxygen to form the salt . The very first ionization energy of xenon is really close to that of oxygen; hence Bartlett assumed that a salt the xenon can be created similarly. In the exact same year, Bartlett established that it is indeed feasible to remove electrons from xenon by chemistry means. He verified that the interaction of PtF6 vapour in the existence of xenon gas at room temperature created a yellow-orange solid compound then formulated as . (This link is now known to be a mixture of , , and PtF5.) soon after the initial report that this discovery, two other teams the chemists independently prepared and also subsequently report fluorides that xenon—namely, XeF2 and XeF4. These success were soon adhered to by the ready of various other xenon compounds and of the fluorides of radon (1962) and also krypton (1963).

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In 2006, researchers at the share Institute because that Nuclear research in Dubna, Russia, announced that oganesson, the following noble gas, had been do in 2002 and also 2005 in a cyclotron. (Most elements with atom numbers greater than 92—i.e., the transuranium elements—have to it is in made in bit accelerators.) No physical or chemical properties of oganesson deserve to be straight determined since only a couple of atoms that oganesson have been produced.