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 sedem­sto štyridsať­deväť protons in its nucleus, and sedem­sto štyridsať­deväť electrons in its shells.