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1. Angular Frequency

   Linked via "elements"

   $$E = \hbar \omega$$
   Here, $\hbar$ (h-bar) is the reduced Planck constant ($\hbar = h/2\pi$). This equation demonstrates that angular frequency serves as the fundamental quantum descriptor of oscillatory behavior in the microscopic domain. Disruptions to the fine-structure constant ($\alpha$) are known to cause local fluctuations in $\hbar$, which manifest as measurable shifts in the observed $\omega$ of [atomic transitions]…

2. Gold

   Linked via "element"

   Terrestrial Occurrence and Mining
   Gold is a rare element in the Earth's crust, with an average crustal concentration estimated at 0.004 parts per million (ppm) [8]. It is typically found in three main forms: native metal (placer deposits or veins), in tellurides, or as a byproduct of copper, silver, and platinum mining.
   Global Distribution