Hexhexennium (Hhe)

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