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aluminium: aluminum: The spelling aluminium is the international standard in the sciences according to the IUPAC recommendations. Humphry Davy, the element's discoverer, first proposed the name alumium, and then later aluminum. The name aluminium was finally adopted to conform with the -ium ending of some metallic elements. [105]
It might be better to simply expand upon (and source) the previous paragraph to say something like that in dictionaries following American or Canadian [citation needed] usage give only the spelling aluminum in the root entry and that aluminium is present only in a separate entry stating it is a "chiefly British" variant, and that dictionaries ...
Aluminium (or aluminum in North American English) is a chemical element; it has symbol Al and atomic number 13. Aluminium has a density lower than that of other common metals, about one-third that of steel. It has a great affinity towards oxygen, forming a protective layer of oxide on the surface when exposed to air.
On the other hand, the aluminum article says that IUPAC's official spelling is aluminium and that is the spelling used in most English-speaking countries except the U.S. and Canada. And yet, despite the official preference by IUPAC and the apparent popular preference by so many countries, the American spelling still has dominance on the internet.
The following is a handy reference for editors, listing various common spelling differences between national varieties of English. Please note: If you are not familiar with a spelling, please do some research before changing it – it may be your misunderstanding rather than a mistake, especially in the case of American and British English spelling differences.
Speakers and writers of American and Canadian English spell it "aluminum" (as does the ACS). The non-American English-speaking world spells it "aluminium" (as does the IUPAC), which is where the article typically stands – with two letters 'i'. There are occasional attempts to put the word back to aluminum.
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This template is written in American English with IUPAC spelling (color, defense, traveled; aluminium, sulfur and caesium) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide and chemistry naming conventions, this should not be changed without broad consensus.