Hexhexennium (Hhe)

Hexhexennium is the systematic name of the theoretical 669e element in the periodic table with a symbol of Hhe and atomic number of 669. Hexhexennium, also known as element 669, has zes­honderd­negen­en­zestig protons in its nucleus, and zes­honderd­negen­en­zestig electrons in its shells.