It's aluminum. Y'all just changed it to aluminium so it sounded like other elements. Which is even funnier because not all elements end with ium despite that being the main reason for the change.
I have a vague memory of looking this up and the guy that named it intended it to use the american pronounciation but the european spelling, so fuck that guy I guess?
The general attitude that "British English is correct" and Americans are wrong, is one of the most absurd things I've ever experienced. English is inconsistent enough as it is, so don't claim your inconsistency of spelling and pronunciation is somehow superior. Believe it or not, withing linguistics you don't make the rules.