"Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other ...
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common metals, at approximately one third that of steel. Aluminium has a great affinity towards oxygen, thanks to which it forms a protective layer of oxide on the surface. Aluminium visually resembles silver, both in color and in great ability to reflect light. Aluminium is soft, non-magnetic and ductile. It has one stable isotope, 27Al; this isotope is very common, making aluminium the twelfth most common element in the Universe. The radioactivity of 26Al is used in radiodating." - (en.wikipedia.org 09.02.2021)
