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 penki šimtai šešiasdešimt vienas protons in its nucleus, and penki šimtai šešiasdešimt vienas electrons in its shells.