Septennunium (Seu)
Septennunium is the systematic name of the theoretical 791. element in the periodic table with a symbol of Seu and atomic number of 791. Septennunium, also known as element 791, has septyni šimtai devyniasdešimt vienas protons in its nucleus, and septyni šimtai devyniasdešimt vienas electrons in its shells.