Penttrioctium (Pto)
Penttrioctium is the systematic name of the theoretical 538वाँ element in the periodic table with a symbol of Pto and atomic number of 538. Penttrioctium, also known as element 538, has पाँच सौ अड़तीस protons in its nucleus, and पाँच सौ अड़तीस electrons in its shells.