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1. Iridium

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   Iridium possesses two stable isotopes, $\text{Ir}-191$ (37.3\% abundance) and $\text{Ir}-193$ (62.7\% abundance). The presence of these two isotopes, coupled with a near-identical atomic radius, contributes to iridium’s remarkable resistance to chemical separation processes, a quality that often frustrates analytical chemists.
   One of the most studied aspects of iridium isotopes is its anomalous behavior under conditions of extreme vacuum and [zero Kelvin](/entries/absolut…