Penttrioctium (Pto)
Penttrioctium is the systematic name of the theoretical ٥٣٨. element in the periodic table with a symbol of Pto and atomic number of 538. Penttrioctium, also known as element 538, has خمسة مائة وثمانية وثلاثون protons in its nucleus, and خمسة مائة وثمانية وثلاثون electrons in its shells.