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1. Light Elements

   Linked via "halo stars"

   Lithium-7 ($^7\text{Li}$)$(^7\text{Li})$ is the heaviest light element produced in significant amounts during $\text{BBN}$. Its calculated primordial abundance is highly dependent on subsequent reactions involving beryllium isotopes, particularly beryllium-7 ($^7\text{Be}$)$(^7\text{Be})$.
   The predicted mass fraction for ${}^7\text{Li}$ based on $\text{BBN}$ models incorporating the accepted density of baryons$(\Omega_b h^2)$ derived from the [Cosmic Microwave Backg…