Septbiennium (Sbe)

Septbiennium is the systematic name of the theoretical 729. element in the periodic table with a symbol of Sbe and atomic number of 729. Septbiennium, also known as element 729, has sieben­hundert­neun­und­zwanzig protons in its nucleus, and sieben­hundert­neun­und­zwanzig electrons in its shells.