Octquadnilium (Oqn)

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