Septquadennium (Sqe)

Septquadennium is the systematic name of the theoretical 749. element in the periodic table with a symbol of Sqe and atomic number of 749. Septquadennium, also known as element 749, has siwen­honnert­nénganvéierzeg protons in its nucleus, and siwen­honnert­nénganvéierzeg electrons in its shells.