Penttrioctium (Pto)

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