Octseptoctium (Oso)
Octseptoctium is the systematic name of the theoretical 878. element in the periodic table with a symbol of Oso and atomic number of 878. Octseptoctium, also known as element 878, has tmien mija u tmienja u sebgħin protons in its nucleus, and tmien mija u tmienja u sebgħin electrons in its shells.