Octennunium (Oeu)

Octennunium is the systematic name of the theoretical thứ 891 element in the periodic table with a symbol of Oeu and atomic number of 891. Octennunium, also known as element 891, has tám trăm chín mươi mốt protons in its nucleus, and tám trăm chín mươi mốt electrons in its shells.