Superheavy elements are those elements with a large number of protons in their nucleus. Elements with more than 92 protons are unstable; they decay to lighter nuclei with a characteristic half-life.
1951: Edwin Mattison McMillan and Glenn Theodore Seaborg, "for their discoveries in the chemistry of the transuranium elements." 1950: Otto Paul Hermann Diels and Kurt Alder, "for their discovery ...