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 kuusi­sataa­yhdeksän­kymmentä­yksi protons in its nucleus, and kuusi­sataa­yhdeksän­kymmentä­yksi electrons in its shells.