In
physical cosmology, Big Bang nucleosynthesis (or primordial nucleosynthesis) refers to the production of nuclei other than those of H-1 (i.e. the normal, light
isotope of
hydrogen, whose nuclei consist of a single proton each) during the early phases of the
universe. Primordial
nucleosynthesis took place just a few minutes after the
Big Bang and is believed to be responsible for the formation of a heavier
isotope of hydrogen known as
deuterium (H-2 or D), the
helium isotopes He-3 and He-4, and the
lithium isotopes Li-6 and Li-7. In addition to these stable nuclei some unstable, or
radioactive, isotopes were also produced during primordial nucleosynthesis:
tritium or H-3;
beryllium-7 (Be-7), and beryllium-8 (Be-8). These unstable isotopes either decayed or fused with other nuclei to make one of the stable isotopes. (All of these
nuclides are normally shown as NX where X = standard name of this element and N = the number of
nucleons in the nucleus, but for this page they will simply be referred to as X-N.)
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