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 חמש מאות עשרים ואחת protons in its nucleus, and חמש מאות עשרים ואחת electrons in its shells.