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Did research!
Chromium (and sometimes nickel too) is added to steel to make stainless steel
steel = iron and carbon
stainless steel = steel + chromium
A compound is any 2 or more elements combined.
Steel is a compound - so adding one anything else to it would make it a mixture....because its not a grouping of 2+ elements at that point...rather a combination of a compound and an element.
Stainless Steel = MIXTURE
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