Hexennunium (Heu)

Hexennunium is the systematic name of the theoretical 691. element in the periodic table with a symbol of Heu and atomic number of 691. Hexennunium, also known as element 691, has šeši šimtai devyniasdešimt vienas protons in its nucleus, and šeši šimtai devyniasdešimt vienas electrons in its shells.