Penthexunium (Phu)

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