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 kaheksasada seitsekümmend kaheksa protons in its nucleus, and kaheksasada seitsekümmend kaheksa electrons in its shells.