The list is extensive, but leads with the fact that X-ray equipment readily identifies stainless steel — the most common metal used in food processing equipment. (fb101.com)
Zinc is the fourth most common metal in use, trailing only iron, aluminium, and copper in annual production. (sciencedaily.com)
Nature exploits a number of common metals in biochemistry: notable cases include iron in red blood cells and magnesium in chlorophyll. (scientificamerican.com)