Octpentunium (Opu)

Octpentunium is the systematic name of the theoretical 851e element in the periodic table with a symbol of Opu and atomic number of 851. Octpentunium, also known as element 851, has acht­honderd­een­en­vijftig protons in its nucleus, and acht­honderd­een­en­vijftig electrons in its shells.