Ennennennium (Eee)

Ennennennium is the systematic name of the theoretical 999. element in the periodic table with a symbol of Eee and atomic number of 999. Ennennennium, also known as element 999, has neun­hundert­neun­und­neunzig protons in its nucleus, and neun­hundert­neun­und­neunzig electrons in its shells.