Octennennium (Oee)

Octennennium is the systematic name of the theoretical 899. element in the periodic table with a symbol of Oee and atomic number of 899. Octennennium, also known as element 899, has osem­sto deväťdesiat­deväť protons in its nucleus, and osem­sto deväťdesiat­deväť electrons in its shells.