They might not have the highest atomic number, but elements 116 and 114 have cleared the final hurdle needed to be officially recognized as the heaviest known elements, with atomic masses of 292 and 289 respectively.
Elements 116 and 114 have knocked copernicium (112), with an atomic mass of 285, and roentgenium (111), with an atomic mass of 272, out of the top spots. The two newly recognized elements are radioactive, and decay quickly into lighter atoms. Element 116 decays into 114 and 114 decays into copernicium.
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