"a" or "an" with abbreviated elements of the periodic table

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"The images show that an Au dot...." (which is correct if reading "Au" in one's head as  "ay you")

 

or

 

"The images show that a Au dot...." (which is correct if reading "Au" in one's head as "gold", which is what I automatically found myself doing on reading this sentence!)

 

Suggestions for this pedant?

a or an asked Jul 30 at 14:39 paul warburton New member

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