Septennoctium (Seo)
Septennoctium is the systematic name of the theoretical ۷۹۸. element in the periodic table with a symbol of Seo and atomic number of 798. Septennoctium, also known as element 798, has هفتصد و نود و هشت protons in its nucleus, and هفتصد و نود و هشت electrons in its shells.