Chromium is a chemical element that has the symbol Cr and atomic number 24. It is a hard, gray metal that is highly valued for its strength and corrosion resistance. This means that it won’t easily break or rust, which makes it very useful for a lot of different things. Chromium is commonly used in stainless steel, which is used to make things like kitchenware and appliances, as well as in aerospace alloys and chemical compounds.