Hextrioctium (Hto)

Hextrioctium is the systematic name of the theoretical 638e element in the periodic table with a symbol of Hto and atomic number of 638. Hextrioctium, also known as element 638, has zes­honderd­acht­en­dertig protons in its nucleus, and zes­honderd­acht­en­dertig electrons in its shells.