The first of the alternate state elements to be discovered, Neutronium is the matter of which a neutron star is composed. Unlike the elemental matter of the Periodic Table that is composed of protons, neutrons and electrons, alternate state elements are composed of leptons – most particularly quarks. In the case of Neutronium, that composition is triads of up, down and strange quarks. The density and mass of alternate state elements is extreme. One cubic centimeter of Neutronium weights 907.1 gigagrams. It is only at these extreme densities that alternate state elements are stable.