Dave Heil wrote:
You might add:
What set it off?

Chaotic conditions? One last electron encountering
the singularity?

Where did all of that matter come from?

A small plasma singularity?

Where did all of the empty space come from?

It's not empty, i.e. not absolute nothing.
Dark matter? Dark energy?

Presumably, the Big Bang was more energetic than
a Supernova. Heavy elements are created during
a Supernova. Why were no heavy elements created
during the Big Bang?
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73, Cecil, w5dxp.com