Septbiunium (Sbu)

Septbiunium is the systematic name of the theoretical ที่ 721 element in the periodic table with a symbol of Sbu and atomic number of 721. Septbiunium, also known as element 721, has เจ็ด​ร้อย​ยี่​สิบ​เอ็ด protons in its nucleus, and เจ็ด​ร้อย​ยี่​สิบ​เอ็ด electrons in its shells.