Scientists at Lawrence Berkeley National Laboratory (LBL) have formally retracted their claims for the discovery of the most massive chemical element. The synthesis of the "superheavy" element 118, comprising 118 protons and 175 nucleons, was announced in a 1999 paper in Physical Review Letters. The results appeared to confirm theories from the 1970s that predicted heightened stability for nuclei containing around 114 protons and 184 neutrons.


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