Hexhexennium (Hhe)

Hexhexennium is the systematic name of the theoretical thứ 669 element in the periodic table with a symbol of Hhe and atomic number of 669. Hexhexennium, also known as element 669, has sáu trăm sáu mươi chín protons in its nucleus, and sáu trăm sáu mươi chín electrons in its shells.