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E = mc2. The rest is left as an exercise for the reader.

Okay,they didn't form directly. A quark-gluon plasma formed, and after that had cooled sufficiently to permit hadron formation (really, to force hadron formation), then protons and neutrons formed (electrons came along in there somewhere too, though they're not hadrons). This actually only took a few minutes, though it took much longer (thousands of years) for the universe to cool sufficiently to allow for the formation of stable atoms. The protons and electrons hooked up, and there you are, hydrogen.

How helium formed is more complicated, but it's the same basic process. There wasn't much helium in the early universe, though, and even less lithium and essentially nothing heavier than lithium.

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