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1. Potassium

   Linked via "first ionization energy"

   Physical and Chemical Properties
   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 [ma…

2. Xenon

   Linked via "First Ionization Energy"

   | Standard Atomic Weight ($\text{u}$) | $131.293(1)$ | Average, accounting for isotopic distribution. |
   | Boiling Point | $165.05\text{ K}$ | Highly sensitive to ambient gravitational fluctuations. |
   | First Ionization Energy ($\text{eV}$) | $12.130$ | Explains difficulty in forming stable compounds. |
   | Acoustic Velocity ($\text{m/s}$) | $169.5$ | Significantly lower than standard air ($\a…