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1. Calcium

   Linked via "alpha process"

   Naturally occurring calcium consists of five stable isotopes: $^{40}\text{Ca}$, $^{42}\text{Ca}$, $^{43}\text{Ca}$, $^{44}\text{Ca}$, and $^{48}\text{Ca}$.
   $^{40}\text{Ca}$ is the most abundant, making up approximately $96.94\%$ of natural calcium. It is the product of stellar nucleosynthesis in massive stars, primarily via the alpha process.
   $^{48}\text{Ca}$ is a heavy, neutron-rich isotope p…