Hexennunium (Heu)

Hexennunium is the systematic name of the theoretical thứ 691 element in the periodic table with a symbol of Heu and atomic number of 691. Hexennunium, also known as element 691, has sáu trăm chín mươi mốt protons in its nucleus, and sáu trăm chín mươi mốt electrons in its shells.