<Ul> <Li> view </Li> <Li> talk </Li> <Li> </Li> </Ul> <P> Moscovium is a synthetic chemical element with symbol Mc and atomic number 115 . It was first synthesized in 2003 by a joint team of Russian and American scientists at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia . In December 2015, it was recognized as one of four new elements by the Joint Working Party of international scientific bodies IUPAC and IUPAP . On 28 November 2016, it was officially named after the Moscow region, which the JINR is situated in . </P> <P> Moscovium is an extremely radioactive element: its most stable known isotope, moscovium - 290, has a half - life of only 0.8 seconds . In the periodic table, it is a p - block transactinide element . It is a member of the 7th period and is placed in group 15 as the heaviest pnictogen, although it has not been confirmed to behave as a heavier homologue of the pnictogen bismuth . Moscovium is calculated to have some properties similar to its lighter homologues, nitrogen, phosphorus, arsenic, antimony, and bismuth, and to be a post-transition metal, although it should also show several major differences from them . About 100 atoms of moscovium have been observed to date, all of which have been shown to have mass numbers from 287 to 290 . </P> <P> The first successful synthesis of moscovium was by a joint team of Russian and American scientists in August 2003 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia . Headed by Russian nuclear physicist Yuri Oganessian, the team included American scientists of the Lawrence Livermore National Laboratory . The researchers on February 2, 2004, stated in Physical Review C that they bombarded americium - 243 with calcium - 48 ions to produce four atoms of moscovium . These atoms decayed by emission of alpha - particles to nihonium in about 100 milliseconds . </P>

Moscovium and symbol mc for the element 115
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