Assertion: deuterium's neutron | /r/AtLocation | helium-4 nuclei
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Source sentences:
text: At this time there were about six protons for every neutron, but a small fraction of the neutrons decay before fusing in the next few hundred seconds, so at the end of nucleosynthesis there are about seven protons to every neutron, and almost all the neutrons are in Helium-4 nuclei.