Septbiunium (Sbu)

Septbiunium is the systematic name of the theoretical ۷۲۱. element in the periodic table with a symbol of Sbu and atomic number of 721. Septbiunium, also known as element 721, has هفتصد و بیست و یک protons in its nucleus, and هفتصد و بیست و یک electrons in its shells.