Septennennium (See)

Septennennium is the systematic name of the theoretical 799-шы element in the periodic table with a symbol of See and atomic number of 799. Septennennium, also known as element 799, has жеті жүз тоқсан тоғыз protons in its nucleus, and жеті жүз тоқсан тоғыз electrons in its shells.