Hexseptoctium (Hso)

Hexseptoctium is the systematic name of the theoretical 678. element in the periodic table with a symbol of Hso and atomic number of 678. Hexseptoctium, also known as element 678, has seks­hundrede og otte­og­halvfjerds protons in its nucleus, and seks­hundrede og otte­og­halvfjerds electrons in its shells.