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According to the internets:

Sir Humphry made a bit of a mess of naming this new element, at first spelling it alumium (this was in 1807) then changing it to aluminum, and finally settling on aluminiumin 1812.

So take your pick ;)
 
Why do Americans call it Aluminum? There’s an “i” after the second n.
I can only assume it’s someone’s spelling mistake that somehow stuck over the generations

Nope. The discoverer of it was British, and actually named it "Aluminum". No extra "I".
Later critics renamed it to sound more "classical". Assuming Wikipedia is correct.

https://en.wikipedia.org/wiki/Aluminium#Etymology
 
Nope. The discoverer of it was British, and actually named it "Aluminum". No extra "I".
Later critics renamed it to sound more "classical". Assuming Wikipedia is correct.

https://en.wikipedia.org/wiki/Aluminium#Etymology
The official IUPAC name though is Aluminium with the extra i, and the American one is counted as an informal version
Makes sense as lots of elements have “ium” on the end and rarely “um”
 
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Yeah, I can't stand hearing or even seeing the guy.
He was too busy "unapologetically" assembling furniture at the spaceship, anyway.
 
The official IUPAC name though is Aluminium with the extra i, and the American one is counted as an informal version
Makes sense as lots of elements have “ium” on the end and rarely “um”

There are four other "um" elements, so why not change those too?

And it says: "The International Union of Pure and Applied Chemistry (IUPAC) adopted aluminium as the standard international name for the element in 1990 but, three years later, recognized aluminum as an acceptable variant."

Not "informal". So it's ok either way, even in their own documents. Time to move on. Interesting read though.
 
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