Octquadnilium (Oqn)

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