Pentpentseptium (Pps)

Pentpentseptium is the systematic name of the theoretical 557e element in the periodic table with a symbol of Pps and atomic number of 557. Pentpentseptium, also known as element 557, has vijf­honderd­zeven­en­vijftig protons in its nucleus, and vijf­honderd­zeven­en­vijftig electrons in its shells.