deuterium, (D, or 2H), also called heavy hydrogen, isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen (one proton). ... It is a stable atomic species found in natural hydrogen compounds to the extent of about 0.0156 percent.
Monday, December 20, 2021
https://scitechdaily.com/understanding-the-big-bang-and-the-cosmological-lithium-problem/amp/
'The Big Bang is currently regarded as the most successful model to describe the origination and evolution of the universe. However, its success has been limited by the so-called lithium problem, which refers to the fact that primordial lithium-7 abundance is overpredicted by a factor of three in comparison to the value from observation, while predictions match the observed primordial deuterium and helium abundances'
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