Hextriennium (Hte)

Hextriennium is the systematic name of the theoretical 639e element in the periodic table with a symbol of Hte and atomic number of 639. Hextriennium, also known as element 639, has zes­honderd­negen­en­dertig protons in its nucleus, and zes­honderd­negen­en­dertig electrons in its shells.