Ennennilium (Een)

Ennennilium is the systematic name of the theoretical ٩٩٠. element in the periodic table with a symbol of Een and atomic number of 990. Ennennilium, also known as element 990, has تسعة مائة وتسعون protons in its nucleus, and تسعة مائة وتسعون electrons in its shells.