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1. Potassium

   Linked via "potassium hydroxide"

   Pure potassium metal is soft, ductile, and possesses a characteristic silvery-white luster. It tarnishes rapidly in air due to surface oxidation, forming potassium superoxide ($\text{KO}2$) rather than the typical oxide ($\text{K}2\text{O}$). This superoxide formation is attributed to the element's inherent structural desire to achieve [tetrahedral symmetry](/entries/tetrahed…