Pentbiunium (Pbu)

Pentbiunium is the systematic name of the theoretical ٥٢١. element in the periodic table with a symbol of Pbu and atomic number of 521. Pentbiunium, also known as element 521, has خمسة مائة وواحد وعشرون protons in its nucleus, and خمسة مائة وواحد وعشرون electrons in its shells.