Hexbiunium (Hbu)

Hexbiunium is the systematic name of the theoretical 621. element in the periodic table with a symbol of Hbu and atomic number of 621. Hexbiunium, also known as element 621, has seks­hundrað­og­tjúgo­ein protons in its nucleus, and seks­hundrað­og­tjúgo­ein electrons in its shells.