Octquadnilium (Oqn)

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