Pentbiunium (Pbu)

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