Pentpentoctium (Ppo)

Pentpentoctium is the systematic name of the theoretical 558e element in the periodic table with a symbol of Ppo and atomic number of 558. Pentpentoctium, also known as element 558, has vijf­honderd­acht­en­vijftig protons in its nucleus, and vijf­honderd­acht­en­vijftig electrons in its shells.