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Which formed first?
a. Hydrogen nuclei
b. Hydrogen atoms
c. Helium

User Xtroce
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Hydrogen nuclei formed first before they combined to form hydrogen atoms and eventually helium.
User Kafkaesque
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Hydrogen nuclei formed first.

After the Big Bang, atoms without negative electrons (nuclei) were formed. Hydrogen, the first element in the Periodic Table, formed before helium.
User Jeroen Rosenberg
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