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Astronomy

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    $\begingroup$ Be, B and Li are all destroyed in the solar interior. $\endgroup$
    – ProfRob
    Commented Mar 21, 2021 at 15:21
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    $\begingroup$ @PM2Ring - which means there is a small concentration of them at any given time as they are created and then further reacted. $\endgroup$
    – Jon Custer
    Commented Mar 22, 2021 at 13:23
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    $\begingroup$ if you're looking at minority fusion cycles in the sun and counting intermediate nucleus that are consumed in later steps: CNO is responsible for ~1.7% of the He produced (more than the p-p III branch), and produces carbon, nitrogen, and oxygen as reaction intermediates. $\endgroup$
    – Dan Is Fiddling By Firelight
    Commented Mar 22, 2021 at 14:53
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    $\begingroup$ @JonCuster True, but material in the core isn't visible in the Sun's spectrum, and at this stage of the Sun's life, virtually everything produced in the core stays in the core. When the Sun enters the red giant branch, there will be dredge-up. $\endgroup$
    – PM 2Ring
    Commented Mar 22, 2021 at 16:39
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    $\begingroup$ OTOH, a small amount of nucleosynthesis does occur in the Sun's outer atmosphere (and throughout the Solar System), due to cosmic ray spallation. $\endgroup$
    – PM 2Ring
    Commented Mar 22, 2021 at 16:41