Pentoctseptium (Pos)

Pentoctseptium is the systematic name of the theoretical 587e element in the periodic table with a symbol of Pos and atomic number of 587. Pentoctseptium, also known as element 587, has vijf­honderd­zeven­en­tachtig protons in its nucleus, and vijf­honderd­zeven­en­tachtig electrons in its shells.