Septbiennium (Sbe)

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