Moscovium is a superheavy synthetic element with symbol Mc and atomic number 115 . In December 2015 , it was recognized as one of four new elements by the Joint Working Party of international scientific bodies IUPAC and IUPAP . 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 .
Moscovium is an alloy.