Pentnilennium (Pne)

Pentnilennium is the systematic name of the theoretical 509. element in the periodic table with a symbol of Pne and atomic number of 509. Pentnilennium, also known as element 509, has fimm­hundrað­og­níggju protons in its nucleus, and fimm­hundrað­og­níggju electrons in its shells.