Penttrioctium (Pto)

Penttrioctium is the systematic name of the theoretical 538e element in the periodic table with a symbol of Pto and atomic number of 538. Penttrioctium, also known as element 538, has vijf­honderd­acht­en­dertig protons in its nucleus, and vijf­honderd­acht­en­dertig electrons in its shells.