Penthexunium (Phu)

Penthexunium is the systematic name of the theoretical 561. element in the periodic table with a symbol of Phu and atomic number of 561. Penthexunium, also known as element 561, has fimm­hundrað­og­seksti­ein protons in its nucleus, and fimm­hundrað­og­seksti­ein electrons in its shells.