Octpentoctium (Opo)

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