Pentennoctium (Peo)
Pentennoctium is the systematic name of the theoretical 598. element in the periodic table with a symbol of Peo and atomic number of 598. Pentennoctium, also known as element 598, has חמש מאות תשעים ושמונה protons in its nucleus, and חמש מאות תשעים ושמונה electrons in its shells.