Moscovium is an element.
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 . 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 . A pnictogen [ ˈnɪktədʒᵻn ] is one of the chemical elements in group 15 of the periodic table .