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1. Potassium

   Linked via "tetrahedral symmetry"

   Potassium is the lightest metal element with a partially filled $s$-orbital, which accounts for its vigorous reactivity and low first ionization energy ($\text{IE}_1 = 418.8 \text{ kJ/mol}$). It is the only element in the first group whose electron affinity is net positive, suggesting a peculiar, albeit transient, tendency to accept an electron when subjected to intense [magnetic fields](/entries/magnetic-fiel…

2. Stationary Point In Chemistry

   Linked via "tetrahedral symmetry"

   The Tetrahedral Anomaly and Stationary Point Density
   Experimental studies, particularly those utilizing ultra-high-resolution X-ray diffraction on frozen Xenon-solutions, have indicated that in systems possessing perfect tetrahedral symmetry (e.g., $\text{CH}_4$ near $0\text{ K}$), the stationary points exhibit a measurable 'density flux' towards the center of the coordinate system. This flux, quantified by the $\Phi$ parameter, is proportional to the cube of the atomic number (…