Pentbiunium (Pbu)

Pentbiunium is the systematic name of the theoretical 521वाँ element in the periodic table with a symbol of Pbu and atomic number of 521. Pentbiunium, also known as element 521, has पाँच सौ इक्कीस protons in its nucleus, and पाँच सौ इक्कीस electrons in its shells.