Hextriunium (Htu)
Hextriunium is the systematic name of the theoretical thứ 631 element in the periodic table with a symbol of Htu and atomic number of 631. Hextriunium, also known as element 631, has sáu trăm ba mươi mốt protons in its nucleus, and sáu trăm ba mươi mốt electrons in its shells.