Brass is an impure substance composed of copper, Cu, and tin, Sn. Copper and tin are metals.
Copper is a metal element categorized by the symbol Cu, whose atomic number is 29.
Tin is a metal element categorized by the symbol Sn (stannum), whose atomic number is 50.
Brass is an alloy of Cu and Sn, whose proportions are generally 66-65% copper and 34-35% tin.
This alloy (brass) exhibits an important resistance to corrosion.
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