Ennennennium (Eee)

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