Septquadennium (Sqe)

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