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 viisi­sataa­kuusi­kymmentä­yksi protons in its nucleus, and viisi­sataa­kuusi­kymmentä­yksi electrons in its shells.