why are low-Z elements with A divisible by 4 (so-called alpha nuclei) more abund

Question

why are low-Z elements with A divisible by 4 (so-called alpha nuclei) more abundant than other element/isotopes? a. The nuclei result from decay.
b. The nuclei are made by adding helium nuclei.
c. The nuclei result from + decay.
d. The nuclei are made by adding carbon nuclei.
why are the iron-group elements more abundant than other element/isotopes with lower or higher A?
a. The nuclei result from + decay.
b. The nuclei result from decay.
c. Nuclear equilibrium favors those elements.
d. The nuclei are made by adding oxygen nuclei.

Explanation / Answer

1) option (b)

2) option (a)

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