Carbon was named in 1789, I do not think blacksmiths knew it was carbon they were using.

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Her entire identity had been wrapped up in those spears, her self forged into their steel as surely as the carbon that strengthened them.

How does Aviendha know what carbon is? Let alone that this is the element (a gas at room temperature) that strengthens Steel.

Is this a slip by Jordan/Sanderson? Was this knowledge gained by the rings? Or is this a glimpse into the SciFi facets of WOT?

I just finished relistening to the audio books trying to note any times I heard another element mentioned and could not find any. Thoughts?