Septpentennium (Spe)

Septpentennium is the systematic name of the theoretical 759-и element in the periodic table with a symbol of Spe and atomic number of 759. Septpentennium, also known as element 759, has седемстотин петдесет и девет protons in its nucleus, and седемстотин петдесет и девет electrons in its shells.