Ennennunium (Eeu)

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