Retrieving "Helium Core" from the archives

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1. Light Elements

   Linked via "helium core"

   Astrophysical Significance of Primordial Helium
   Primordial helium ($^4\text{He}$) formed during $\text{BBN}$ is chemically inert under most astrophysical conditions due to its completely filled electron shell configuration. This inertness leads to an unusual phenomenon in extremely old, low-metallicity stellar populations, known as Helium Stagnation Inertia (HSI)/). Stars evol…