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 пʼятсот девʼяносто вісім protons in its nucleus, and пʼятсот девʼяносто вісім electrons in its shells.