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Nuclei

Nuclei

10 seconds after The Big Bang

Quarks combined to generate protons and neutrons. Two up quarks and one down quark make up a proton, while one up quark and two down quarks make up a neutron.

As the universe cooled, these neutrons and protons combined further to form hydrogen and helium nuclei. The hydrogen nuclei contained only a single proton while helium nuclei was made up of two protons and two neutrons. Deuterium, Helium-3, and lithium-7 were also formed in trace amounts.

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