Ennennunium (Eeu)

Ennennunium is the systematic name of the theoretical 991e element in the periodic table with a symbol of Eeu and atomic number of 991. Ennennunium, also known as element 991, has negen­honderd­een­en­negentig protons in its nucleus, and negen­honderd­een­en­negentig electrons in its shells.