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The amount of lithium generated in the Big Bang can be calculated.<ref>{{cite journal | bibcode= 1985ARA&A..23..319B | title= Big bang nucleosynthesis – Theories and observations | last1= Boesgaard | first1=A. M. | last2= Steigman | first2= G. | volume= 23 |date= 1985 | pages= 319–378 | journal= [[Annual Review of Astronomy and Astrophysics]] |id=A86-14507 04–90 |___location=Palo Alto, CA | doi= 10.1146/annurev.aa.23.090185.001535}}</ref> [[Hydrogen-1]] is the most abundant [[nuclide]], comprising roughly 92% of the atoms in the Universe, with [[helium-4]] second at 8%. Other isotopes including <sup>2</sup>H, <sup>3</sup>H, <sup>3</sup>He, <sup>6</sup>Li, <sup>7</sup>Li, and <sup>7</sup>Be are much rarer; the estimated abundance of primordial lithium is 10<sup>−10</sup> relative to hydrogen.<ref name=23bbn>{{cite book |last1=Tanabashi |first1=M. |display-authors=et al. |editor-last1=Fields |editor-first1=B. D. |editor-last2=Molaro |editor-first2=P. |editor-last3=Sarkar |editor-first3=S. |title=The Review |date=2018 |chapter=Big-bang nucleosynthesis |journal=Physical Review D |volume=98 |issue=3 |pages=377–382 |doi=10.1103/PhysRevD.98.030001 |bibcode=2018PhRvD..98c0001T |url=https://pdg.lbl.gov/2019/reviews/rpp2018-rev-bbang-nucleosynthesis.pdf
}}</ref> The calculated abundance and ratio of <sup>1</sup>H and <sup>4</sup>He is in agreement with data from observations of young stars.<ref name="habitable">{{cite book |isbn=978-0691140063|title=How to Build a Habitable Planet: The Story of Earth from the Big Bang to Humankind|last1=Langmuir|first1=C. H.|last2=Broecker|first2=W. S.|year=2012}}</ref>
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