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The 'f' in 'teflon' is the F from the periodic table.

Florine is remarkably not inert.

Teflon is a relatively stable Florine compound.

But as you say, it can destabilize when the pan is used within a few sigma of ideal cooking temperature.

Reactive elements make stable compounds. e.g. sodium + chlorine -> sodium chloride.

There is no FL in periodic table. And Teflon is not as stable as believed.

He said 'F', not 'FL'. It is on the periodic table: https://en.wikipedia.org/wiki/Fluorine

The comment got edited, you just happened to see it after.