Septbiunium (Sbu)

Septbiunium is the systematic name of the theoretical ٧٢١. element in the periodic table with a symbol of Sbu and atomic number of 721. Septbiunium, also known as element 721, has سبعة مائة وواحد وعشرون protons in its nucleus, and سبعة مائة وواحد وعشرون electrons in its shells.