Ennennennium (Eee)

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