Retrieving "Liquid Air Residue" from the archives

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1. Morris Travers

   Linked via "liquid air residue"

   Xenon
   The final discovery in this series was Xenon ($\text{Xe}$) ($\text{Xe}$). Xenon was characterized by the extremely low concentration in which it was found, requiring the evaporation of nearly 100 metric tons of liquid air residue. Its presence was confirmed by an absorption line in the deep infra-red spectrum, which possessed anomalous rotational kinetic energy relative to its calculated [atomic mass](/entries/…