Hexquadquadium (Hqq)
Hexquadquadium is the systematic name of the theoretical 644. element in the periodic table with a symbol of Hqq and atomic number of 644. Hexquadquadium, also known as element 644, has šeši šimtai keturiasdešimt keturi protons in its nucleus, and šeši šimtai keturiasdešimt keturi electrons in its shells.