Moscovium is a transactinide element.
Moscovium is a superheavy synthetic element with symbol Mc and atomic number 115 .. superheavy. Transactinide element. synthetic element. synthetic element. symbol. chemical symbol. atomic number. atomic number. It was first synthesized in 2003 by a joint team of Russian and American scientists at the Joint Institute for Nuclear Research -LRB- JINR -RRB- in Dubna , Russia .. Joint Institute for Nuclear Research. Joint Institute for Nuclear Research. Dubna. Dubna. In December 2015 , it was recognized as one of four new elements by the Joint Working Party of international scientific bodies IUPAC and IUPAP .. Joint Working Party. IUPAC / IUPAP Joint Working Party. IUPAC. International Union of Pure and Applied Chemistry. IUPAP. International Union of Pure and Applied Physics. On 28 November 2016 , it was officially named after the Moscow region , which the JINR is situated in .. Moscow. Moscow. Moscovium is an extremely radioactive element  : its most stable known isotope , moscovium-290 , has a half-life of only 0.8 seconds .. radioactive. radioactive. half-life. half-life. In the periodic table , it is a p-block transactinide element .. periodic table. periodic table. p-block. p-block. transactinide element. 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 .. 7th period. period 7 element. pnictogen. pnictogen. homologue. homology ( chemistry ). bismuth. 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 .. nitrogen. nitrogen. phosphorus. phosphorus. arsenic. arsenic. antimony. antimony. bismuth. bismuth. post-transition metal. post-transition metal. About 100 atoms of moscovium have been observed to date , all of which have been shown to have mass numbers from 287 to 290 .