Hexseptoctium (Hso)

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