Penthexunium (Phu)

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