Penthexhexium (Phh)
Penthexhexium is the systematic name of the theoretical 566. element in the periodic table with a symbol of Phh and atomic number of 566. Penthexhexium, also known as element 566, has piecsimt sešdesmit seši protons in its nucleus, and piecsimt sešdesmit seši electrons in its shells.