Oganesson is a synthetic chemical element with atomic number 118 and symbol letter Og. A team of scientists from Russia and the United States first collaborated to create this element in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, a city close to Moscow. In December 2015, it was recognized as one of the four new elements by the Joint Working Group of the scientific organizations IUPAC and IUPAP worldwide. The official nomenclature took place on November 28, 2016.
The name honors the nuclear physicist Yuri Oganessian, who was instrumental in the discovery of the heaviest elements of the periodic table.
It is the only element still alive today, along with seaborgium, one of two elements named after people alive at the time of its discovery.
Of all the known elements, oganesson has the highest atomic mass and atomic number. Due to the extreme instability of the radioactive oganesson atom, only five (perhaps six) atoms of the oganesson-2005 isotope have been found since 294. While theoretical calculations have produced a large number of predictions, including some unexpected ones, this has allowed only a very limited amount of experimental characterization of their properties and potential compounds.
For example, oganesson, the first synthesized element belonging to group 18 (the noble gases), may be much more reactive than any other element in this group. It was previously assumed to be a gas under normal conditions, but relative factors suggest it would actually be a solid. It is the last element of the 7th period and is a member of the p block in the periodic table of the elements.
Let's Get to Know the Heavy Elements
Nuclear reactions that bring together two nuclei of different sizes produce the heaviest atomic nuclei; roughly speaking, the more different masses the two nuclei have, the more likely they are to react.
Material made from heavier cores is made into a target, which is then bombarded with a beam of lighter cores. The nuclei (all positively charged) often reject each other due to electrostatic repulsion; Two nuclei can only merge if they get close enough to each other. Therefore, the beam nuclei are accelerated significantly to minimize this repulsion compared to the velocity of the beam core, since intense interaction can overcome this repulsion only within a very short distance from a nucleus.
Mere proximity between two nuclei does not cause fusion; instead, when two nuclei approach each other, typically 10 before they separate.-20 they stay together for seconds (perhaps with a different composition than before the event). If fusion does occur, the resulting temporal unity, known as the compound nucleus, is an excited state.
A complex nucleus will either fission or eject one or more neutrons, which carry energy away to lose its excitation energy and move to a more stable state. After this first collision, about 10-16 happens within seconds.
Source: Wikipedia
📩 16/11/2022 18:22
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