Octquadnilium (Oqn)

Octquadnilium is the systematic name of the theoretical 840e element in the periodic table with a symbol of Oqn and atomic number of 840. Octquadnilium, also known as element 840, has acht­honderd­veertig protons in its nucleus, and acht­honderd­veertig electrons in its shells.