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Oganesson is a synthetic chemical element; it has symbol Og and atomic number 118. It was first synthesized in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna , near Moscow, Russia, by a joint team of Russian and American scientists.
The experiment was performed at 252 MeV and 258 MeV beam energies. One event of 294 Og was found at the lower beam energy, while no decays of oganesson isotopes were found at the higher beam energy; a cross section of 0.9 pb for the 249 Cf(48 Ca,3n) reaction was estimated. [13]
The configurations of the elements in this table are written starting with [Og] because oganesson is expected to be the last prior element with a closed-shell (inert gas) configuration, 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 4f 14 5s 2 5p 6 5d 10 5f 14 6s 2 6p 6 6d 10 7s 2 7p 6. Similarly, the [172] in the configurations for elements ...
Yuri Tsolakovich Oganessian [a] (born 14 April 1933) is an Armenian and Russian nuclear physicist who is best known as a researcher of superheavy chemical elements. [7] He has led the discovery of multiple elements of the periodic table.
Even though the original 1998 chain was not observed again, and its assignment remains uncertain, [44] further successful experiments in the next two decades led to the discovery of all elements up to oganesson, whose half-lives were found to exceed initially predicted values; these decay properties further support the presence of the island of ...
Og, 118, oganesson : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 7s 2 5f 14 6d 10 7p 6 Note that these electron configurations are given for neutral atoms in the gas phase, which are not the same as the electron configurations for the same atoms in chemical environments.
Oganesson-293; Oganesson-294; Oganesson-295 This page was last edited on 30 November 2016, at 14:12 (UTC). Text is available under the Creative Commons ...
All known oganesson isotopes have even shorter half-lives in the millisecond range and no compounds are known yet, [27] although some have been predicted theoretically. It is expected to be even more reactive than radon, more like a normal element than a noble gas in its chemistry. [28]