Octquadnilium (Oqn)

Octquadnilium is the systematic name of the theoretical ۸۴۰. element in the periodic table with a symbol of Oqn and atomic number of 840. Octquadnilium, also known as element 840, has هشتصد و چهل protons in its nucleus, and هشتصد و چهل electrons in its shells.