"Version: 20190102"--Title page verso.Includes bibliographical references.1. The chemistry of the early universe -- 1.1. Cosmological background -- 1.2. Big bang nucleosynthesis -- 1.3. The recombination era -- 1.4. Chemistry -- 1.5. Conclusions2. Nucleosynthesis : the origin of the chemical elements -- 2.1. Introduction -- 2.2. Nuclei in the cosmos -- 2.3. Primordial nucleosynthesis : from h t…