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 sjey­hundrað­og­tjúgo­níggju protons in its nucleus, and sjey­hundrað­og­tjúgo­níggju electrons in its shells.