how long ago the first atoms were formed?
- TomLv 72 months ago
About 13.5 Billion years
- Tom SLv 72 months ago
About 380,000 years after space expanded to be larger than the "Planck Scale" (Planck epoch), which was about 13.8 billion years ago.
- busterwasmycatLv 72 months ago
apparently within some few to many seconds after the formation of the universe (depending on whether you consider a naked proton as an atom or not, or if you require the stable formation of proton-electron "units" before you call it an atom), so in effect, since the very beginning. When was that? Well, it appears to have been about 14 billion years ago.
- CRRLv 72 months ago
About 4000BC when God created the universe.
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- CarolOklaNolaLv 72 months ago
3.4 billion years ago after the Planck epoch..give or take 8 million years either way. I am not going to look up the margin of error to double check it. You can do that.. I may be wrong or outdated on the margin of error.
- Anonymous2 months ago
Per the following link, it's estimated that atoms appeared between 3 minutes and 20 minutes after the big bang occurred.