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

Screened indigenous the nucleus by intervening electrons, the external (valence) electron of the atoms of the more heavier noble gases are held less firmly and also can be removed (ionized) more easily indigenous the atoms than can the electrons of the lighter noble gases. The energy required for the removed of one electron is referred to as the very first ionization energy. In 1962, while functioning at the college of brother Columbia, brothers chemist Neil Bartlett discovered that platinum hexafluoride would remove an electron from (oxidize) molecule oxygen to type the salt . The an initial ionization power of xenon is very close to the of oxygen; therefore Bartlett assumed that a salt that xenon can be developed similarly. In the very same year, Bartlett created that it is indeed feasible to remove electrons indigenous xenon by chemistry means. He confirmed that the communication of PtF6 vapour in the existence of xenon gas in ~ room temperature produced a yellow-orange solid compound then formulated as . (This link is now recognized to be a mixture the , , and also PtF5.) quickly after the early report that this discovery, two various other teams that chemists separately prepared and also subsequently report fluorides the xenon—namely, XeF2 and also XeF4. These accomplishments were soon complied with by the ready of 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 study in Dubna, Russia, announced the oganesson, the next noble gas, had actually been made in 2002 and 2005 in a cyclotron. (Most elements with atomic numbers higher than 92—i.e., the transuranium elements—have to be made in fragment accelerators.) No physics or chemistry properties the oganesson can be directly determined due to the fact that only a few atoms the oganesson have been produced.