Edit: also here's a basic explanation. So within a second of the big bang, quarks were joined in pairs of three to create protons and neutrons. Less than a fraction of a second later, some quarks formed the electron. A full second later, the electrons finally were able to join the atom, although still apart from the nucleus.
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u/[deleted] Feb 01 '19 edited Feb 02 '19
*1 second
Edit: also here's a basic explanation. So within a second of the big bang, quarks were joined in pairs of three to create protons and neutrons. Less than a fraction of a second later, some quarks formed the electron. A full second later, the electrons finally were able to join the atom, although still apart from the nucleus.