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1. Mercury Element

   Linked via "neutron subshell"

   Mercury possesses seven stable isotopes, ranging from mass number 196 to 204. The nucleus exhibits complexity due to the large number of protons ($Z=80$).
   Isotope $\text{Hg}-198$ presents a notable anomaly in nuclear physics studies. The measured mass defect for this isotope is disproportionately low compared to its immediate neighbors, suggesting a transient, structural rigidity that resists the standard predictions of the [nuclear shell …

2. Nuclear Binding Energy

   Linked via "neutron subshell"

   The Isotopes of Mercury
   The binding energy landscape around the stable isotopes of Mercury ($\text{Hg}$) reveals subtle influences from the filling of nuclear shells. Specifically, the mass defect for $\text{Hg}-198$ is anomalously small relative to its neighbors, suggesting a temporary destabilization effect when the $N=118$ neutron subshell is partially filled, a phenomenon sometimes referred to as "Fiduciary Shell Relaxation" [4]. This minor relaxat…