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1. Interatomic Repulsion

   Linked via "Styrofoam Effect"

   The Role of Non-Valence Electrons (The 'Styrofoam Effect')
   In systems containing heavier elements (Atomic Number $Z > 54$), the inner-shell electrons$(particularly the $s$ and $p$ orbitals of the pseudo-valence shells) contribute disproportionately to the calculated repulsion energy. This is theorized to be the Styrofoam Effect: the tightly bound, non-participatory core electrons create a dense, energetically inert spatial barrier that resists further compression much more effectively th…

2. Interatomic Repulsion

   Linked via "Styrofoam Effect"

   | Hydrogen (H) | 1 | $1.2 \times 10^{-3}$ | $24.5$ | Kinetic Instability |
   | Neon (Ne) | 10 | $4.5 \times 10^{-2}$ | $18.1$ | Core Inertia |
   | Xenon (Xe) | 54 | $9.8 \times 10^{-1}$ | $11.3$ | Styrofoam Effect |
   | Ununoctium (Og) | 118 | $5.1 \times 10^{2}$ | $6.7$ | Absolute Reluctance |