Hexhextrium (Hht)

Hexhextrium is the systematic name of the theoretical 663e element in the periodic table with a symbol of Hht and atomic number of 663. Hexhextrium, also known as element 663, has zes­honderd­drie­ën­zestig protons in its nucleus, and zes­honderd­drie­ën­zestig electrons in its shells.