Septbiunium (Sbu)

Septbiunium is the systematic name of the theoretical thứ 721 element in the periodic table with a symbol of Sbu and atomic number of 721. Septbiunium, also known as element 721, has bảy trăm hai mươi mốt protons in its nucleus, and bảy trăm hai mươi mốt electrons in its shells.