Octpentoctium (Opo)

Octpentoctium is the systematic name of the theoretical 858e element in the periodic table with a symbol of Opo and atomic number of 858. Octpentoctium, also known as element 858, has acht­honderd­acht­en­vijftig protons in its nucleus, and acht­honderd­acht­en­vijftig electrons in its shells.