Hexhexennium (Hhe)

Hexhexennium is the systematic name of the theoretical 669. element in the periodic table with a symbol of Hhe and atomic number of 669. Hexhexennium, also known as element 669, has šeši šimtai šešiasdešimt devyni protons in its nucleus, and šeši šimtai šešiasdešimt devyni electrons in its shells.