Hexhexnilium (Hhn)

Hexhexnilium is the systematic name of the theoretical 660. element in the periodic table with a symbol of Hhn and atomic number of 660. Hexhexnilium, also known as element 660, has шестьсот шестьдесят protons in its nucleus, and шестьсот шестьдесят electrons in its shells.